cpp arguments code example
Example 1: c++ variable arguments
#include <iostream>
#include <cstdarg>
using namespace std;
double average(int num,...) {
va_list valist;
double sum = 0.0;
int i;
va_start(valist, num);
for (i = 0; i < num; i++) {
sum += va_arg(valist, int);
}
va_end(valist);
return sum/num;
}
int main() {
cout << "[Average 3 numbers: 44,55,66] -> " << average(3, 44,55,66) << endl;
cout << "[Average 2 numbers: 10,11] -> " << average(2, 10,11) << endl;
cout << "[Average 1 number: 18] -> " << average(1, 18) << endl;
}
Example 2: command line options in c++
int main(int argc, char *argv[])
{
for(int i = 1; i < argc; i++){
if(!strcmp(argv[i], "-h") || !strcmp(argv[i], "--help") ){
printf("Usage: App <options>\nOptions are:\n");
printf("Option list goes here");
exit(0);
}else if(!strcmp(argv[i], "-c") || !strcmp(argv[i], "--custom")){
printf("argument accepted");
}else{
if(i == argc-1){
break;
}
MessageBox(NULL, TEXT("ERROR: Invalid Command Line Option Found: \"%s\".\n", argv[i]), TEXT("Error"), MB_ICONERROR | MB_OK);
}
}
MessageBox(NULL, TEXT("ERROR: No Command Line Option Found. Type in --hep or -h"), TEXT("Error"), MB_ICONERROR | MB_OK);
}