c - 如何在 int main() C 编程中调用您创建的函数？

Question

我试图从 main 函数调用一个函数，但是当我编译并运行它时，它给了我一个随机数。我想要求用户在 yrBorn 函数中输入一个数字，然后将其返回到 main 函数，最后将其显示在终端中。

int yrBorn(int);
#include<stdio.h>
int yrBorn (int yearBorn)    
{   
    printf("Enter the year you were born in: ");
    scanf("%d", &yearBorn);
    return yearBorn;
}

int main ()
{       
    printf("%d",yrBorn);
}

Answer 1

你必须像这样理解你的代码:

int yrBorn(int);  // function prototype say it must accept a int argument
#include<stdio.h>
int yrBorn (int yearBorn) //it must accept a argument of int type because of this definition    
{   
    printf("Enter the year you were born in: ");
    scanf("%d", &yearBorn);
    return yearBorn;
}

int main ()
{       
   printf("%d",yrBorn); // You are passing function pointer here not a function call use like yrBorn(1994)
    printf("%d",yrBorn(1994)); //it will work :)
}