Sum From File With Random Strings

#include <stdio.h>
#include <stdlib.h>
#define MAX_LEN 32

main(){
    int sum=0, n;
    char string[MAX_LEN];
    FILE * fp, * fo;
    ((fp=fopen("file.txt", "r"))!=NULL)?:(exit(1));
    ((fo=fopen("output.txt", "w"))!=NULL)?:(exit(1));
    while(feof(fp)==0)
        if((fscanf(fp, "%d", &n))==1){
            sum+=n;
            fprintf(fo, "%d\t", n);
        }
        else
            fscanf(fp, "%s", string);
    fprintf(fo, "\nLa somma e' %d\n", sum);
    fclose(fp);
    fclose(fo);
    return 0;
}