In C language, the implicit return type is int

If a function has no return type, the return type will default to int. If no return type is specified, no error is generated. However, even if the return type is int, the C99 version does not allow the return type to be omitted.

Example

#include<stdio.h>
my_function(int x) {
   return x * 2;
}
main(void) {
   printf("Value is: %d", my_function(10));
}

Output

Value is: 20

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