Thread: conflicting types

Hello everyone.. I need your help! I want to make a header file for the prototype of function sum and two .c files. One for main and one for the implementation of the function. So, when I try to compile the implementation file.c it says:

linux01:/home/users/-----------/Exerc3>gcc -o himplementation.o himplementation.c
himplementation.c:5: error: conflicting types for 'sum'
hfiles.h:1: error: previous declaration of 'sum' was here

What's the problem?

main.c

Code:

#include <stdio.h>
#include <stdlib.h>
#include "himplementation.h"


int main(int argc, char *argv[])
{
    int n, m, k, j;


    scanf("%d %d", &n, &m);
    int inp[n][m];


    for (k = 0; k < n; k++) {
        for (j = 0; j < m; j++) {
            scanf("%d", &inp[k][j]);
        }
    }
    printf("\n");


    for (k = 0; k < n; k++) {
        for (j = 0; j < m; j++) {
            sum(n, m, k, j, inp);
        }
    }


//  for (k = 0; k < n; k++)
//      free(*(input+k));
//  free(input);


    return 0;
}

function implementation.c

Code:

#include <stdio.h>
#include "hfiles.h"


int sum(int n, int m, int k, int j, int input[n][m])
{
    int maxsum, max;


    max = 0;
    maxsum = 0;
    if (k == n-1) {
        while (j < m-1) {
            if (input[k][j] > max) {
                max = input[k][j];
            }
            j++;
        }
        maxsum = input[k][j] + max;
        max = 0;
    }
    else if (k < n && j == 0) {
        if (input[k+1][0] > max)
            max = input[k+1][0];
        printf("max1 = %d, input[i+1][0] = %d\n", max, input[k+1][0]);
        if (input[k+1][1] > max)
            max = input[k+1][1];
        printf("max2 = %d, input[i+1][1] = %d\n", max, input[k+1][1]);
        if (input[k+1][m-1] > max)
            max = input[k+1][m-1];
        printf("max3 = %d, input[i+1][m] = %d\n", max, input[k+1][m-1]);


        maxsum = input[k][j] + max;
        max = 0;
    }
    else if (k < n && (j > 0 && j < m-1)) {
            if (input[k+1][j-1] > max)
                max = input[k+1][j-1];
            if (input[k+1][j] > max)
                max = input[k+1][j];
            if (input[k+1][j+1] > max)
                max = input[k+1][j+1];


            maxsum = max + input[k][j];
            max = 0;
    }
    else if (k < n && j == m-1) {
            if (input[k+1][m-2] > max)
                max = input[k+1][m-2];
            if (input[k+1][m-1] > max)
                max = input[k+1][m-1];
            if (input[k+1][0] > max)
                max = input[k+1][0];


            maxsum = max + input[k][j];
            max = 0;
    }
    printf("%d, max = %d, maxsum = %d\n", input[k][j], max, maxsum);
    //sum(n, m, i, j+1, input);
}

prototype of function:

Code:

int sum(int, int, int, int, int);

Ok.. So, what I have to do?

Into what?

integer array

Like this?

Code:

int sum(int n, int m, int, int, int input[n][m]);

When I do so, it says:
/usr/lib/gcc/i486-linux-gnu/4.2.4/../../../../lib/crt1.o: In function `_start':
(.text+0x18): undefined reference to `main'
collect2: ld returned 1 exit status

Originally Posted by Sotiris Kaniras

When I do so, it says:
/usr/lib/gcc/i486-linux-gnu/4.2.4/../../../../lib/crt1.o: In function `_start':
(.text+0x18): undefined reference to `main'
collect2: ld returned 1 exit status

Well?

I just wrote "gcc -o himplementation.o himplementation.c"