Looping explanation for written test exam and interview in c programming language

 

What will be output of following c code?

#include<stdio.h>

extern int x;

int main(){

    do{

        do{

             printf("%o",x);

         }

         while(!-2);

    }

    while(0);

    return 0;

}

int x=8;

Explanation-2

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;

}

Explanation-3

What will be output of following c code?

#include<stdio.h>

int main(){

    int x=011,i;

    for(i=0;i<x;i+=3){

         printf("Start ");

         continue;

         printf("End");

    }

    return 0;

}

Explanation-4
What will be output of following c code? 

#include<stdio.h>

int main(){

    int i,j;

    i=j=2,3;

    while(--i&&j++)

         printf("%d %d",i,j);

    return 0;

}

Explanation-5

What will be output of following c code?

#include<stdio.h>

int main(){

    static int i;

    for(++i;++i;++i) {

         printf("%d ",i);

         if(i==4) break;

    }

    return 0;

}

Explanation-6

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;

}

Explanation-7

What will be output of following c code?

#include<stdio.h>

int main(){

    for(;;) {

         printf("%d ",10);

    }

    return 0;

}
Explanation-8
What will be output of following c code?

        

#include<stdio.h>

int r();

int main(){

    for(r();r();r()) {

         printf("%d ",r());

    }

    return 0;

}

int r(){

    int static num=7;

    return num--;

}

Explanation-9

What will be output of following c code?

        

#include<stdio.h>

#define p(a,b) a##b

#define call(x) #x

int main(){

    do{

         int i=15,j=3;

         printf("%d",p(i-+,+j));

    }

    while(*(call(625)+3));

    return 0;

}

Explanation-10

#include<stdio.h>

int main(){

    int i;

    for(i=0;i<=5;i++);

    printf("%d",i)

    return 0;

}

Explanation-11

What will be output of following c code?

#include<stdio.h>

int i=40;

extern int i;

int main(){

    do{

         printf("%d",i++);

    }

    while(5,4,3,2,1,0);

    return 0;

}

Explanation-12

What will be output of following c code?

#include<stdio.h>

char _x_(int,...);

int main(){

    char (*p)(int,...)=&_x_;

    for(;(*p)(0,1,2,3,4); )

         printf("%d",!+2);

    return 0;

}

char _x_(int a,...){

    static i=-1;

    return i+++a;

}

Explanation-13

What will be output of following c code?

#include<stdio.h>

int main(){

    int i;

    for(i=10;i<=15;i++){

         while(i){

             do{

                 printf("%d ",1);

                 if(i>>1)

                      continue;

             }while(0);

             break;

         }

    }

    return 0;

}

Explanation-14

How many times this loop will execute?

#include<stdio.h>

int main(){

    char c=125;

    do

         printf("%d ",c);

    while(c++);

    return 0;

}

Explanation-15

What will be output of following c code?

        

#include<stdio.h>

int main(){

    int x=123;

    int i={

         printf("c" "++")

    };

    for(x=0;x<=i;x++){

         printf("%x ",x);

    }

    return 0;

}

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