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#include<stdio.h>
#include<iostream>
using namespace std;
void fun(int a)
{
    return a;
 
}
void fun(char a)
{
    return a;
}
void fun(double a)
{
    return a;
}
int main()
{
    int c=fun(10);
}

prog.cpp: In function ‘void fun(int)’:
prog.cpp:6:12: error: return-statement with a value, in function returning 'void' [-fpermissive]
prog.cpp: In function ‘void fun(char)’:
prog.cpp:11:12: error: return-statement with a value, in function returning 'void' [-fpermissive]
prog.cpp: In function ‘void fun(double)’:
prog.cpp:15:12: error: return-statement with a value, in function returning 'void' [-fpermissive]
prog.cpp: In function ‘int main()’:
prog.cpp:19:17: error: void value not ignored as it ought to be
prog.cpp:19:9: warning: unused variable ‘c’ [-Wunused-variable]

Standard output is empty