Technical questions with solution in C programming language

1)

main(int argc, char **argv)

{

 printf("enter the character");

 getchar();

 sum(argv[1],argv[2]);

}

sum(num1,num2)

int num1,num2;

{

 return num1+num2;

}

Answer:

Compiler error.

Explanation:

argv[1] & argv[2] are strings. They are passed to the function sum without converting it to integer values.  

2)

# include

int one_d[]={1,2,3};

main()

{

 int *ptr; 

 ptr=one_d;

 ptr+=3;

 printf("%d",*ptr);

}

Answer:-

garbage value

Explanation:

ptr pointer is pointing to out of the array range of one_d.

3)

# include

aaa() {

  printf("hi");

 }

bbb(){

 printf("hello");

 }

ccc(){

 printf("bye");

 }

main()

{

  int (*ptr[3])();

  ptr[0]=aaa;

  ptr[1]=bbb;

  ptr[2]=ccc;

  ptr[2]();

}

Answer:-

bye 

Explanation:

ptr is array of pointers to functions of return type int.ptr[0] is assigned to address of the function aaa. Similarly ptr[1] and ptr[2] for bbb and ccc respectively. ptr[2]() is in effect of writing ccc(), since ptr[2] points to ccc.

5)

#include

main()

{

FILE *ptr;

char i;

ptr=fopen("zzz.c","r");

while((i=fgetch(ptr))!=EOF)

printf("%c",i);

}

Answer:

contents of zzz.c followed by an infinite loop 

 

Explanation:

The condition is checked against EOF, it should be checked against NULL.

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