Explore topic-wise MCQs in Testing Subject.

This section includes 657 Mcqs, each offering curated multiple-choice questions to sharpen your Testing Subject knowledge and support exam preparation. Choose a topic below to get started.

1.

What will be the output of the program? #include<stdio.h> int main() { void fun(char*); char a[100]; a[0] = 'A'; a[1] = 'B'; a[2] = 'C'; a[3] = 'D'; fun(&a[0]); return 0; } void fun(char *a) { a++; printf("%c", *a); a++; printf("%c", *a); }

A. AB
B. BC
C. CD
D. No output
Answer» C. CD
Discussion
2.

Which of the following statements are correct about the function? long fun(int num) { int i; long f=1; for(i=1; i<=num; i++) f = f * i; return f; }

A. The function calculates the value of 1 raised to power num.
B. The function calculates the square root of an integer
C. The function calculates the factorial value of an integer
D. None of above
Answer» D. None of above
Discussion
3.

Assuming, integer is 2 byte, What will be the output of the program? #include<stdio.h> int main() { printf("%x n", -2<<2); return 0; }

A. ffff
B. 0
C. fff8
D. Error
Answer» D. Error
Discussion
4.

What will be the output of the program? #include<stdio.h> int main() { int i=-3, j=2, k=0, m; m = ++i || ++j && ++k; printf("%d, %d, %d, %d n", i, j, k, m); return 0; }

A. 2, 2, 0, 1
B. 1, 2, 1, 0
C. -2, 2, 0, 0
D. -2, 2, 0, 1
Answer» E.
Discussion
5.

What will be the output of the program? #include<stdio.h> int main() { int x=12, y=7, z; z = x!=4 || y == 2; printf("z=%d n", z); return 0; }

A. z=0
B. z=1
C. z=4
D. z=2
Answer» C. z=4
Discussion
6.

What will be the output of the program? #include<stdio.h> int main() { static int a[20]; int i = 0; a[i] = i ; printf("%d, %d, %d n", a[0], a[1], i); return 0; }

A. 1, 0, 1
B. 1, 1, 1
C. 0, 0, 0
D. 0, 1, 0
Answer» D. 0, 1, 0
Discussion
7.

What will be the output of the program? #include<stdio.h> int main() { float a=0.7; if(a < 0.7) printf("C n"); else printf("C++ n"); return 0; }

A. C
B. C++
C. Compiler error
D. Non of above
Answer» B. C++
Discussion
8.

What will be the output of the program ? #include<stdio.h> int main() { int a=250; printf("%1d n", a); return 0; }

A. 1250
B. 2
C. 50
D. 250
Answer» E.
Discussion
9.

What will be the output of the program? #include<stdio.h> int main() { float *p; printf("%d n", sizeof(p)); return 0; }

A. 2 in 16bit compiler, 4 in 32bit compiler
B. 4 in 16bit compiler, 2 in 32bit compiler
C. 4 in 16bit compiler, 4 in 32bit compiler
D. 2 in 16bit compiler, 2 in 32bit compiler
Answer» B. 4 in 16bit compiler, 2 in 32bit compiler
Discussion
10.

What will be the output of the program if value 25 given to scanf()? #include<stdio.h> int main() { int i; printf("%d n", scanf("%d", &i)); return 0; }

A. 25
B. 2
C. 1
D. 5
Answer» D. 5
Discussion
11.

What will be the output of the program ? #include<stdio.h> int main() { printf("%c n", ~('C'*-1)); return 0; }

A. A
B. B
C. C
D. D
Answer» C. C
Discussion
12.

What will be the output of the program ? #include<stdio.h> int main() { FILE *fp; unsigned char ch; /* file 'abc.c' contains "This is IndiaBIX " */ fp=fopen("abc.c", "r"); if(fp == NULL) { printf("Unable to open file"); exit(1); } while((ch=getc(fp)) != EOF) printf("%c", ch); fclose(fp); printf(" n", ch); return 0; }

A. This is IndiaBIX
B. This is
C. Infinite loop
D. Error
Answer» D. Error
Discussion
13.

What will be the output of the program ? #include<stdio.h> int main() { char *p; p="%d n"; p++; p++; printf(p-2, 23); return 0; }

A. 21
B. 23
C. Error
D. No output
Answer» C. Error
Discussion
14.

What will be the output of the program ? #include<stdio.h> int main() { FILE *fp; char ch, str[7]; fp=fopen("try.c", "r"); /* file 'try.c' contains "This is Nagpur" */ fseek(fp, 9L, SEEK_CUR); fgets(str, 5, fp); puts(str); return 0; }

A. agpur
B. gpur
C. Nagp
D. agpu
Answer» E.
Discussion
15.

What will be the output of the program ? #include<stdio.h> int main() { printf("%%%% n"); return 0; }

A. %%%%%
B. %%
C. No output
D. Error
Answer» C. No output
Discussion
16.

What will be the output of the program? #include<stdio.h> int i; int fun(); int main() { while(i) { fun(); main(); } printf("Hello n"); return 0; } int fun() { printf("Hi"); }

A. Hello
B. Hi Hello
C. No output
D. Infinite loop
Answer» B. Hi Hello
Discussion
17.

What will be the output of the program? #include<stdio.h> void fun(int*, int*); int main() { int i=5, j=2; fun(&i, &j); printf("%d, %d", i, j); return 0; } void fun(int *i, int *j) { *i = *i**i; *j = *j**j; }

A. 5, 2
B. 10, 4
C. 2, 5
D. 25, 4
Answer» E.
Discussion
18.

What will be the output of the program? #include<stdio.h> int main() { float fval=7.29; printf("%d n", (int)fval); return 0; }

A. 0
B. 0.0
C. 7.0
D. 7
Answer» E.
Discussion
19.

What will be the output of the program? #include<stdio.h> #include<math.h> int main() { printf("%d, %d, %d n", sizeof(3.14f), sizeof(3.14), sizeof(3.14l)); return 0; }

A. 4, 4, 4
B. 4, 8, 8
C. 4, 8, 10
D. 4, 8, 12
Answer» D. 4, 8, 12
Discussion
20.

What will be the output of the program in 16 bit platform (Turbo C under DOS)? #include<stdio.h> int main() { int fun(); int i; i = fun(); printf("%d n", i); return 0; } int fun() { _AX = 1990; }

A. Garbage value
B. 0 (Zero)
C. 1990
D. No output
Answer» D. No output
Discussion
21.

What will be the output of the program? #include<stdio.h> int reverse(int); int main() { int no=5; reverse(no); return 0; } int reverse(int no) { if(no == 0) return 0; else printf("%d,", no); reverse (no--); }

A. Print 5, 4, 3, 2, 1
B. Print 1, 2, 3, 4, 5
C. Print 5, 4, 3, 2, 1, 0
D. Infinite loop
Answer» E.
Discussion
22.

What will be the output of the program? #include<stdio.h> void fun(int); typedef int (*pf) (int, int); int proc(pf, int, int); int main() { int a=3; fun(a); return 0; } void fun(int n) { if(n > 0) { fun(--n); printf("%d,", n); fun(--n); } }

A. 0, 2, 1, 0,
B. 1, 1, 2, 0,
C. 0, 1, 0, 2,
D. 0, 1, 2, 0,
Answer» E.
Discussion
23.

Point out the error in the program? #include<stdio.h> /* Assume there is a file called 'file.c' in c: tc directory. */ int main() { FILE *fp; fp=fopen("c: tc file.c", "r"); if(!fp) printf("Unable to open file."); fclose(fp); return 0; }

A. No error, No output.
B. Program crashes at run time.
C. Output: Unable to open file.
D. None of above
Answer» D. None of above
Discussion
24.

Which of the following statement is correct about the program? #include<stdio.h> int main() { FILE *fp; char ch; int i=1; fp = fopen("myfile.c", "r"); while((ch=getc(fp))!=EOF) { if(ch == ' n') i++; } fclose(fp); return 0; }

A. The code counts number of characters in the file
B. The code counts number of words in the file
C. The code counts number of blank lines in the file
D. The code counts number of lines in the file
Answer» E.
Discussion
25.

Which of the following statement is correct about the program? #include<stdio.h> int main() { FILE *fp; char str[11], ch; int i=0; fp = fopen("INPUT.TXT", "r"); while((ch=getc(fp))!=EOF) { if(ch == ' n' || ch == ' ') { str[i]=' 0'; strrev(str); printf("%s", str); i=0; } else str[i++]=ch; } fclose(fp); return 0; }

A. The code writes a text to a file
B. The code reads a text files and display its content in reverse order
C. The code writes a text to a file in reverse order
D. None of above
Answer» C. The code writes a text to a file in reverse order
Discussion
26.

What will be the output of the program ? #include<stdio.h> int main() { float a=3.15529; printf("%2.1f n", a); return 0; }

A. 3.00
B. 3.15
C. 3.2
D. 3
Answer» D. 3
Discussion
27.

Point out the correct statements about the program? #include<stdio.h> int main() { FILE *fptr; char str[80]; fptr = fopen("f1.dat", "w"); if(fptr == NULL) printf("Cannot open file"); else { while(strlen(gets(str))>0) { fputs(str, fptr); fputs(" n", fptr); } fclose(fptr); } return 0; }

A. The code copies the content of one file to another
B. The code writes strings that are read from the keyboard into a file.
C. The code reads a file
D. None of above
Answer» C. The code reads a file
Discussion
28.

What will be the output of the program ? #include<stdio.h> int main() { int k=1; printf("%d == 1 is" "%s n", k, k==1?"TRUE":"FALSE"); return 0; }

A. k == 1 is TRUE
B. 1 == 1 is TRUE
C. 1 == 1 is FALSE
D. K == 1 is FALSE
Answer» C. 1 == 1 is FALSE
Discussion
29.

What will be the output of the program ? #include<stdio.h> char *str = "char *str = %c%s%c; main(){ printf(str, 34, str, 34);}"; int main() { printf(str, 34, str, 34); return 0; }

A. char *str = "char *str = %c%s%c; main(){ printf(str, 34, str, 34);}"; main(){ printf(str, 34, str, 34);}
B. char *str = %c%s%c; main(){ printf(str, 34, str, 34);}
C. No output
D. Error in program
Answer» B. char *str = %c%s%c; main(){ printf(str, 34, str, 34);}
Discussion
30.

If the file 'source.txt' contains a line "Be my friend" which of the following will be the output of below program? #include<stdio.h> int main() { FILE *fs, *ft; char c[10]; fs = fopen("source.txt", "r"); c[0] = getc(fs); fseek(fs, 0, SEEK_END); fseek(fs, -3L, SEEK_CUR); fgets(c, 5, fs); puts(c); return 0; }

A. friend
B. frien
C. end
D. Error in
E. <i class="C-code">fseek();</i>
Answer» D. Error in
Discussion
31.

What will be the output of the program ? #include&lt;stdio.h&gt; int main() { FILE *ptr; char i; ptr = fopen("myfile.c", "r"); while((i=fgetc(ptr))!=NULL) printf("%c", i); return 0; }

A. Print the contents of file "myfile.c"
B. Print the contents of file "myfile.c" upto NULL character
C. Infinite loop
D. Error in program
Answer» D. Error in program
Discussion
32.

While calling the fprintf() function in the format string conversion specifier %s can be used to write a character string in capital letters.

A. True
B. False
Answer» C.
Discussion
33.

The maximum combined length of the command-line arguments including the spaces between adjacent arguments is

A. 128 characters
B. 256 characters
C. 67 characters
D. It may vary from one operating system to another
Answer» E.
Discussion
34.

Which of the following statements are correct about the program? #include&lt;stdio.h&gt; char *fun(unsigned int num, int base); int main() { char *s; s=fun(128, 2); s=fun(128, 16); printf("%s n",s); return 0; } char *fun(unsigned int num, int base) { static char buff[33]; char *ptr = &amp;buff[sizeof(buff)-1]; *ptr = ' 0'; do { *--ptr = "0123456789abcdef"[num %base]; num /=base; }while(num!=0); return ptr; }

A. It converts a number to a given base.
B. It converts a number to its equivalent binary.
C. It converts a number to its equivalent hexadecimal.
D. It converts a number to its equivalent octal.
Answer» B. It converts a number to its equivalent binary.
Discussion
35.

What will be the output of the program? #include&lt;stdio.h&gt; int main() { const c = -11; const int d = 34; printf("%d, %d n", c, d); return 0; }

A. Error
B. -11, 34
C. 11, 34
D. None of these
Answer» C. 11, 34
Discussion
36.

Which of the following statements are correct about the below C-program? #include&lt;stdio.h&gt; int main() { int x = 10, y = 100%90, i; for(i=1; i&lt;10; i++) if(x != y); printf("x = %d y = %d n", x, y); return 0; } 1 : The printf() function is called 10 times. 2 : The program will produce the output x = 10 y = 10 3 : The ; after the if(x!=y) will NOT produce an error. 4 : The program will not produce output.

A. 1
B. 2, 3
C. 3, 4
D. 4
Answer» C. 3, 4
Discussion
37.

Which of the following sentences are correct about a for loop in a C program? 1: for loop works faster than a while loop. 2: All things that can be done using a for loop can also be done using a while loop. 3: for(;;); implements an infinite loop. 4: for loop can be used if we want statements in a loop get executed at least once.

A. 1
B. 1, 2
C. 2, 3
D. 2, 3, 4
Answer» E.
Discussion
38.

Which of the following statements are correct about the below program? #include&lt;stdio.h&gt; int main() { int n = 0, y = 1; y == 1 ? n=0 : n=1; if(n) printf("Yes n"); else printf("No n"); return 0; }

A. Error: Declaration terminated incorrectly
B. Error: Syntax error
C. Error: Lvalue required
D. None of above
Answer» D. None of above
Discussion
39.

What will be the output of the program ? #include&lt;stdio.h&gt; int main() { char *str; str = "%d n"; str++; str++; printf(str-2, 300); return 0; }

A. No output
B. 30
C. 3
D. 300
Answer» E.
Discussion
40.

Is this a correct way for NULL pointer assignment? int i=0;char *q=(char*)i;

A. Yes
B. No
Answer» C.
Discussion
41.

What will be the output of the program if the array begins at 65472 and each integer occupies 2 bytes? #include&lt;stdio.h&gt; int main() { int a[3][4] = {1, 2, 3, 4, 4, 3, 2, 1, 7, 8, 9, 0}; printf("%u, %u n", a+1, &amp;a+1); return 0; }

A. 65474, 65476
B. 65480, 65496
C. 65480, 65488
D. 65474, 65488
Answer» C. 65480, 65488
Discussion
42.

What will be the output of the program ? #include&lt;stdio.h&gt; #include&lt;string.h&gt; int main() { char sentence[80]; int i; printf("Enter a line of text n"); gets(sentence); for(i=strlen(sentence)-1; i &gt;=0; i--) putchar(sentence[i]); return 0; }

A. The sentence will get printed in same order as it entered
B. The sentence will get printed in reverse order
C. Half of the sentence will get printed
D. None of above
Answer» C. Half of the sentence will get printed
Discussion
43.

What will be the output of the program ? #include&lt;stdio.h&gt; struct course { int courseno; char coursename[25]; }; int main() { struct course c[] = { {102, "Java"}, {103, "PHP"}, {104, "DotNet"} }; printf("%d ", c[1].courseno); printf("%s n", (*(c+2)).coursename); return 0; }

A. 103 DotNet
B. 102 Java
C. 103 PHP
D. 104 DotNet
Answer» B. 102 Java
Discussion
44.

Point out the error in the program? struct emp { int ecode; struct emp *e; };

A. Error: in structure declaration
B. Linker Error
C. No Error
D. None of above
Answer» D. None of above
Discussion
45.

We want to test whether a value lies in the range 2 to 4 or 5 to 7. Can we do this using a switch?

A. Yes
B. No
Answer» B. No
Discussion
46.

If scanf() is used to store a value in a char variable then along with the value a carriage return( r) also gets stored it.

A. True
B. False
Answer» C.
Discussion
47.

The way the break is used to take control out of switch and continue to take control of the beginning of the switch?

A. Yes
B. No
Answer» C.
Discussion
48.

By default, the data type of a constant without a decimal point is int, whereas the one with a decimal point is a double.

A. Yes
B. No
Answer» B. No
Discussion
49.

A char variable can store either an ASCII character or a Unicode character.

A. True
B. False
Answer» B. False
Discussion
50.

Which of the following statements are correct about the below program? #include&lt;stdio.h&gt; int main() { int i = 10, j = 20; if(i = 5) &amp;&amp; if(j = 10) printf("Have a nice day"); return 0; }

A. Output: Have a nice day
B. No output
C. Error: Expression syntax
D. Error: Undeclared identifier
E. <i class="C-code">if</i>
Answer» D. Error: Undeclared identifier
Discussion