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# C Sample Question

1. ```main()
{
int i;
printf("%d",scanf("%d",&i));  // value 10 is given as input here
}```

1

Explanation:

Scanf returns number of items successfully read and not 1/0. Here 10 is given as input which should have been scanned successfully. So number of items read is 1.
2. ```#define f(g,g2) g##g2
main()
{
int var12=100;
printf("%d",f(var,12));
}```

100
3. ```main()
{
int i=0;

for(;i++;printf("%d",i)) ;
printf("%d",i);
}```

1

Explanation:

before entering into the for loop the checking condition is "evaluated". Here it evaluates to 0 (false) and comes out of the loop, and i is incremented (note the semicolon after the for loop).
4. ```#include‹stdio.h›
main()
{
char s[]={'a','b','c','\n','c','\0'};
char *p,*str,*str1;
p=&s[3];
str=p;
str1=s;
printf("%d",++*p + ++*str1-32);
}```

M

Explanation:

p is pointing to character '\n'.str1 is pointing to character 'a' ++*p meAnswer:"p is pointing to '\n' and that is incremented by one." the ASCII value of '\n' is 10. then it is incremented to 11. the value of ++*p is 11. ++*str1 meAnswer:"str1 is pointing to 'a' that is incremented by 1 and it becomes 'b'. ASCII value of 'b' is 98. both 11 and 98 is added and result is subtracted from 32". i.e. (11+98-32)=77("M");
5. ```#include‹stdio.h›
main()
{
struct xx
{
int x=3;
char name[]="hello";
};
struct xx *s=malloc(sizeof(struct xx));
printf("%d",s->x);
printf("%s",s->name);
}```

Compiler Error

Explanation:

Initialization should not be done for structure members inside the structure declaration

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