Cfrgtkky

I developed a C program that does addition of integers but the problem I am having with this is that it needs to take input from stdin via input text (not interactive). However after testing I can only get it to work for a single line of input when it should work for multiple, assume this sample input are all in a single input file ((Line 1) 123+456= (Line 2) 999999999+1= ).

I think it has to do with EOF and it should go through and repeat until finished. I tried putting an EOF in the first while loop but the output is very different than what it should be. The input format has to stay the same and cannot be changed. Is there anyway I can get it to do operations until the end of input file?

#include<stdio.h>

#include<stdbool.h>



int main() {

    char c;

    char a[100], b[100], array[101];

    int n = 0;

//It should scan through everyrthing then exit and it think start arround HERE

        while ((c = (char) getchar()) != '=') { 

        array[n] = c;

        putchar(c);

        n++;

    }

    printf("=n");

    array[n] = '';

    int n1 = 0, n2 = -1;

    while (n1 + n2 < n) { //Splits the array into two separate char arrays

        if (array[n1] == '+') {

            n2 = 0;

            n1 += 1;

        }

        if (n2 == -1) {

            a[n1] = array[n1];

            n1++;

        } else {

            b[n2] = array[n1 + n2];

            n2++;

        }

    }

    n1--;

    a[n1] = b[n2] = '';

    int i = 0, z = 0, p = 0;

    char array2[101];

    bool val = false;

    while (n1 > 0 || n2 > 0) { //Addition Calculation

        int x = 0, y = 0;

        if (n1 > 0)

            x = a[n1 - 1] - '0';



        if (n2 > 0)

            y = b[n2 - 1] - '0';

        z = x + y;



        if (val)

            z = z + p;



        if (z > 9) {

            p = z % 10;

            array2[i++] = (char) (p + '0');

            p = z / 10;

            val = true;



        } else {

            array2[i++] = (char) (z + '0');

            val = false;

        }

        n1--;

        n2--;

    }

    if (val) {

        array2[i++] = (char) (p + '0');

        array2[i] = '';

    }



    for (n = i - 1; n >= 0; n--) { //Print Result

        printf("%c", array2[n]);

    }

    printf("n");



return 0;

}

Using scanf() what you want is a 4-liner:

#include <stdio.h>



int main(void)

{

    int a, b;

    char op, ch;

    while (scanf(" %d %c %d %c", &a, &op, &b, &ch) == 4 && op == '+' && ch == '=')

        printf("%d+%d=%dn", a, b, a + b);

}