Question

I was participating in some coding contests and luckily my code also ran. However my solution was not expected because i was wrong with the pattern of taking input.

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The question involved taking in an integer as an input and performing some operation and returning a different or same integer. I do not have any problem with the program, I just don’t know how to code so as to take inputs like this

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Input

The input will contain several test cases (not more than 10). 
Each test case is a single  line with a number n, 0 <= n <= 1 000 000 000. 
It is the number given as input.

Output

For each test case output a single line, containing the integer returned.

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Example

Input:
12
2

Output:
13
2

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My code is

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#include <stdio.h>

int functionReturningInteger(int n)
{
// implementation
........ 
return num;
}


int main(void)
{

int number;
//printf("Enter the number: ");
scanf("%d",&number);
printf(functionReturningInteger(number));
return 0;

}

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How am i supposed to know how many inputs they will give ( although they do provide a maximum limit). And if i use an array to store these inputs whose size is equal to the maximum limit, how do i check the size of an integer array in c ?

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I will appreciate anybody helping out with a small piece of code. Also if am able to test it against an input test file and generate an “output.txt” (output file). I already have the desired output file “des.txt”. Then how can i match whether both the files are same or not ?

Answer 1

#include <stdio.h>
int scanned;
while((scanned = scanf("%d", &number)) != EOF) {
    printf("%d\n", functionReturningInteger(number));
}

If scanf detects the end of input before a successful conversion, it returns EOF.

For the other questions, redirect input and output,

$ ./your_prog < input.txt > output.txt

and compare

$ comp output.txt des.txt