问题
When run, I cannot input anything and the program just end and return nothing, though in my code I want to input and output something. And then I tried to debug, I set a lot of key points in the function that I defined, but it directly goes to the end of the code. It seems that the function I defined can't be run. I am confused about that. Could you tell me what was wrong? Thank you in advance.
#include<stdio.h>
void day_of_year();
int main() {
day_of_year;
return 0;
}
void day_of_year()
{
int year; int month; int day;
scanf_s("%d %d %d", &year, &month, &day);
int day_tab[2][13] = {
{0,31,28,31,30,31,30,31,31,30,31,30,31},
{0,31,29,31,30,31,30,31,31,30,31,30,31} };
int flag, j;
flag = (year % 400 == 0) || ((year % 100 != 0) && (year % 4) == 0);
for (j = 1; j < month; j++) day += day_tab[flag][j];
printf("%d", day);
}
回答1:
To call the function, your statement should read day_of_year();, with the parentheses.
Without the parentheses, day_of_year; is an expression that evaluates the address of the function, then doesn't do anything with it.
回答2:
You need to call it by adding a set of parenthesis. Otherwise it's just an unused expression.
int main() {
day_of_year();
return 0;
}
来源：https://stackoverflow.com/questions/61788495/why-it-seems-that-the-function-i-defined-cant-run