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C Interview Questions And Answers - Part 4.

What is the output of following c program?
#include<stdio.h>
int main() {

int goto=5;
printf("%d",goto);
return 0;
}

Output: Compilation error. 
Because it declared an invalid variable name. goto is a keyword in c language and variable name cannot be any keyword.

What is the output of following c program?
#include<stdio.h>
int main() {

long int 1a=5l;
printf("%ld",1a);
return 0;
}

Output: Compilation error.
Because variable name cannot start with numeric value.

What is the output of following c program?
#include<stdio.h>
int main() {

int max-val=100;
int min-val=10;
int avg-val;
avg-val = max-val + min-val / 2;

printf("%d",avg-val);
return 0;
}

Output: Compilation error.
Because variable name cannot have special character except underscore ( _ ).

What is the output of following c program?
#include<stdio.h>
int xyz=10;
int main() {

int xyz=20;
printf("%d",xyz);
return 0;
}

Output: 20
Because two variables can have same name in different scope.

What is the output of following c program?
#include<stdio.h>
int main() {

int ABC=10;
printf("%d",abc);
return 0;
}

Output: Compilation error.
Because variable name is case sensitive.

What is the output of following c program?
#include<stdio.h>
int main() {

int xyz=20;
int xyz;
printf("%d",xyz);
return 0;
}

Output: Compilation error.
Because two local variables cannot have same name in same scope.

What is the output of following c program?
#include<stdio.h>
void main() {

char *str="CQUESTIONBANK";
printf(str+9);
getch();
}
Output: BANK

What is the output of following c program?
#include<stdio.h>
extern struct student {

int a;
int b;
int c;
int d;
}s={6,7,8,9};

void main() {
printf("%d %d %d %d",s.a,s.b,s.c,s.d);
getch();
}
Output: 6 7 8 9

What is the output of following c program?
#include<stdio.h>

struct student {
int roll;
int cgpa;
int sgpa[8];
};

void main() {
struct student s={12,8,7,2,5,9};
int *ptr;

ptr=(int *)&s;
printf("%d",*(ptr+3));
getch();
}
Output: 2

What is the output of following c program?
#include<stdio.h>

struct game {
int level;
int score;

struct player {
char *name;
}g2;
}g1;

void main() {
printf("%d  %d  %s",g1.level,g1.score,g1.g2.name);
getch();
}
Output: 0 0 (null)
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