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C Programming - Library Functions - Discussion

Discussion Forum : Library Functions - Find Output of Program (Q.No. 1)
Library Functions
1.
What will be the output of the program? 
#include<stdio.h>

int main()
{
    int i;
    i = printf("How r u\n");
    i = printf("%d\n", i);
    printf("%d\n", i);
    return 0;
}
How r u
7
2
How r u
8
2
How r u
1
1
Error: cannot assign printf to variable
Answer: Option
Explanation:
In the program, printf() returns the number of charecters printed on the console

i = printf("How r u\n"); This line prints "How r u" with a new line character and returns the length of string printed then assign it to variable i.
So i = 8 (length of '\n' is 1).

i = printf("%d\n", i); In the previous step the value of i is 8. So it prints "8" with a new line character and returns the length of string printed then assign it to variable i. So i = 2 (length of '\n' is 1).

printf("%d\n", i); In the previous step the value of i is 2. So it prints "2".

Discussion:
11 comments Page 2 of 2.
Balamithra said:   1 decade ago
Hey how did you get 2?
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