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我正在编写一个简单的程序来查找第一个'n'整数的阶乘.但是在编译时我遇到了这个错误.甚至认为fact()函数的返回类型是long int,错误仍然存​​在.

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

int main(){
    int i;
    for(i=0;i<30;i++)
        printf("%ld\n", fact(i));
    return 0;
}

long int fact(int n){
    if(n==0)
        return 1;
    else 
        return (long)(n*fact(n-1));
}

错误:

fourth.c:7:3: warning: format ‘%ld’ expects argument of type ‘long int’, but argument 2 has type ‘int’ [-Wformat=]
printf("%ld\n", fact(i));
^
fourth.c: At top level:
fourth.c:11:10: error: conflicting types for ‘fact’
long int fact(int n){
         ^
fourth.c:7:19: note: previous implicit declaration of ‘fact’ was here
printf("%ld\n", fact(i));
               ^