filling up an array in c++

Using C++11

#include <algorithm>
#include <iostream>

int main() {
    char array[80];
    std::fill(std::begin(array),std::begin(array)+10,'r');
}

Or, as mentioned in the comments you can use std::fill(array,array+10,'r').

You can use the [] operator and assign a char value.

char y[80];
for(int b=0; b<10; ++b)
    y[b] = 'r';

And yes, std::fill is a more idiomatic and modern C++ way to do this, but you should know about the [] operator too!

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