程序代码：

#include<stdio.h>

int main()
{
    FILE * f1;
    FILE * f2;
    if((f1 = fopen("1.log","r+")) == NULL)
    {
        printf("发现未知错误 \n");
        return 0;
    }
    if((f2 = fopen("2.log","r+")) == NULL)
    {
        printf("发现未知错误 \n");
        return 0;
    }
    int row=0;
    int col=0;
    char c1,c2;
    while(!feof(f1))
    {
        c1=fgetc(f1);
        c2=fgetc(f2);
        if(c1=='\n')
        {
            ++row;
            col=0;
        }
        if(c1!=c2)
        {
            printf("%d行%d列 发现不同\n",row+1,col);
            return 0;
        }
        ++col;
    }
    return 0;
}