C函数的参数和返回值

#include <stdio.h>
void my_function() {
   printf("This is a function that takes no argument, and returns nothing.");
}
main() {
   my_function();
}

This is a function that takes no argument, and returns nothing.

#include <stdio.h>
int my_function() {
   printf("This function takes no argument, But returns 50</p><p>");
   return 50;
}
main() {
   int x;
   x = my_function();
   printf("Returned Value: %d", x);
}

This function takes no argument, But returns 50
Returned Value: 50

#include <stdio.h>
void my_function(int x) {
   printf("This function is taking %d as argument, but returns nothing", x);
   return 50;
}
main() {
   int x;
   x = 10;
   my_function(x);
}

#include <stdio.h>
int my_function(int x) {
   printf("This will take an argument, and will return its squared value</p><p>");
   return x * x;
}
main() {
   int x, res;
   x = 12;
   res = my_function(12);
   printf("Returned Value: %d", res);
}