programming in c

Question

#include "stdio.h"
int main()
{
    char arr[100];
    printf("%d", scanf("%s", arr));
    /* Suppose that input value given
        for above scanf is "GeeksQuiz" */
    return 1;
}

(A) 9
(B) 1
(C) 10
(D) 100

 which is true ? explain it .

Answer 1

Here we have to understand what the functions printf() and scanf() returns..

1) printf() returns the number of characters that are printed..

2) scanf() unlike the printf() function returns the number of items which are inputted instead of number of characters..

 printf("%d", scanf("%s", arr));   

So here we are inputting only one item which is "arr"..So 

scanf("%s", arr)   returns 1 as the return value as number of items here is 1..So 1 will be printed by printf(). 

Hence B) should be the correct answer..

Comments

@habibkhan Thank you

Answer 2

suppose the base address of arr is 1000...in   printf("%d", scanf("%s", arr)); scanf will take the input and printf is just calculating how many things are stored at address 1000....it does not matter what type of input you will enter the output will be 1 only because at any particular time you are going to store only one value at base address 1000 if you input  even '.' then also output will be 1

hence final output is 1 only.

Answer 3

B. 1 is the answer