Looping questions and answers with explanation for written test exam and interview in c programming language
(1)
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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