Interview Questions

1. How many times will this loop execute? main() { char c=125; do printf("%d ",c); while(c++); }

Options:

a. 3 times

b. Single time

c. Char is wrong

d. Finite times

Reveal Answer

2. _____ Statement execute the body of the loop before the test is performed.

Options:

a. If

b. do

c. While

d. For

Reveal Answer

3. What is the o/p of following program #include<stdio.h> int main(){ float a=1.5f; while(a){ printf("%.f ",a); a-=.5f; } return 0; }

Options:

a. 2 1 1

b. 0 1 2

c. No output

d. Compilation Error

Reveal Answer

4. While loop without any body is possible. For example: #include<stdio.h> int main() { int i=0; while(i<=8) i++; printf("%d ",i); return 0; }

Options:

a. 1

b. 8

c. 9

d. No output

Reveal Answer

5. What will be output of following c code? #include<stdio.h> int main(){ int i=2,j=2; while(i+1?--i:j++) printf("%d",i); return 0; }

Options:

a. 1

b. 2 3

c. 1 2

d. 0 1

Reveal Answer

6. What will be output of the following code? #include<stdio.h> int main() { unsigned int i = 65535; /* Assume 2 byte integer and 65535 is the max value*/ while(i++ != 0) printf("%d",++i); printf("\n"); return 0; }

Options:

a. Infinity

b. 0 1 2 ... 65535

c. 0 1 2 ... 32767 - 32766 -32765 -1 0

d. No output

Reveal Answer

7. What will be the output of the program? #include<stdio.h> int main() { int i = 5; while(i-- >= 0) printf("%d,", i); i = 5; printf("\n"); while(i-- >= 0) printf("%i,", i); while(i-- >= 0) printf("%d,", i); return 0; }

Options:

a. 4, 3, 2, 1, 0, -1 4, 3, 2, 1, 0, -1

b. 5, 4, 3, 2, 1, 0 5, 4, 3, 2, 1, 0

c. Error

d. 5, 4, 3, 2, 1, 0 5, 4, 3, 2, 1, 0 5, 4, 3, 2, 1, 0

Reveal Answer

8. Point out the error, if any in the while loop. #include<stdio.h> int main() { int i=1; while() { printf("%d\n", i++); if(i>10) break; } return 0; }

Options:

a. There should be a condition in the while loop

b. There should be at least a semicolon in the while

c. The while loop should be replaced with for loop

d. No error

Reveal Answer

9. What is the o/p of following program #include <stdio.h> int main() { int i=0; while(i < 10) { i++; if (i == 6) continue; if (i == 8) break; printf("%d\n",i); } }

Options:

a. 0 1 2 3 4 5 6 7 8 9

b. 1 2 3 4 5 6 7 8 9

c. 1 2 3 4 5 7

d. 1 2 3 4 5 6 7

Reveal Answer

10. What will be output of following c code? #include<stdio.h> int main(){ int i=1; for(i=0;i=-1;i=1) { printf("%d ",i); if(i!=1) break; } return 0; }

Options:

a. 1

b. 0

c. -1

d. Compilation Error

Reveal Answer

11. What is the o/p of following code #include<stdio.h> int main() { for (int i=0;i<3;i++) { for(int j=0;j<3;j++) { if (i == j) break; printf("%d %d - ",i,j); } } }

Options:

a. 0 0 – 0 1 – 0 2 – 1 0 – 1 1 – 1 2 – 2 0 – 2 1 – 2 2 -

b. 1 0 - 2 0 – 2 1 -

c. 0 1 – 0 2 – 1 0 –1 2 – 2 0 – 2 1 -

d. No Output

Reveal Answer

12. What will be the output? #include<stdio.h> int main() { int i=1; for(i=0; i <= 3; i++) { printf("%d ",i); if(i == 2) break; } }

Options:

a. 0 1 2 3

b. 0 1 2

c. 1

d. 1 2 3

Reveal Answer

13. What will be the output? #include<stdio.h> int main() { int i=1; for(i=0;i=-1;i=1) { printf("%d ",i); if(i != 1) break; } }

Options:

a. 0

b. 1

c. -1

d. Compilation Error

Reveal Answer

14. What will be the output of the program? #include<stdio.h> int main() { int i=0; for(; i <= 5; i++); printf("%d", i); }

Options:

a. 0, 1, 2, 3, 4, 5

b. 5

c. 1, 2, 3, 4

d. 6

Reveal Answer

Interview Questions and Answer

1. How many times will this loop execute? main() { char c=125; do printf("%d ",c); while(c++); }

2. _____ Statement execute the body of the loop before the test is performed.

3. What is the o/p of following program #include<stdio.h> int main(){ float a=1.5f; while(a){ printf("%.f ",a); a-=.5f; } return 0; }

4. While loop without any body is possible. For example: #include<stdio.h> int main() { int i=0; while(i<=8) i++; printf("%d ",i); return 0; }

5. What will be output of following c code? #include<stdio.h> int main(){ int i=2,j=2; while(i+1?--i:j++) printf("%d",i); return 0; }

6. What will be output of the following code? #include<stdio.h> int main() { unsigned int i = 65535; /* Assume 2 byte integer and 65535 is the max value*/ while(i++ != 0) printf("%d",++i); printf("\n"); return 0; }

7. What will be the output of the program? #include<stdio.h> int main() { int i = 5; while(i-- >= 0) printf("%d,", i); i = 5; printf("\n"); while(i-- >= 0) printf("%i,", i); while(i-- >= 0) printf("%d,", i); return 0; }

8. Point out the error, if any in the while loop. #include<stdio.h> int main() { int i=1; while() { printf("%d\n", i++); if(i>10) break; } return 0; }

9. What is the o/p of following program #include <stdio.h> int main() { int i=0; while(i < 10) { i++; if (i == 6) continue; if (i == 8) break; printf("%d\n",i); } }

10. What will be output of following c code? #include<stdio.h> int main(){ int i=1; for(i=0;i=-1;i=1) { printf("%d ",i); if(i!=1) break; } return 0; }

11. What is the o/p of following code #include<stdio.h> int main() { for (int i=0;i<3;i++) { for(int j=0;j<3;j++) { if (i == j) break; printf("%d %d - ",i,j); } } }

12. What will be the output? #include<stdio.h> int main() { int i=1; for(i=0; i <= 3; i++) { printf("%d ",i); if(i == 2) break; } }

13. What will be the output? #include<stdio.h> int main() { int i=1; for(i=0;i=-1;i=1) { printf("%d ",i); if(i != 1) break; } }

14. What will be the output of the program? #include<stdio.h> int main() { int i=0; for(; i <= 5; i++); printf("%d", i); }

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