Question

How to check if a string is all uppercase in C++

Answer 1

#include <iostream>
#include <string>
#include <algorithm>

bool isUpper(const std::string& s) {
    return std::all_of(s.begin(), s.end(), [](unsigned char ch){ return std::isupper(ch); });
}

int main() {
    std::string s = "CPPPROGRAMMING";
    
    if (isUpper(s)) {
        std::cout << "Is uppercase" << '\n';
    } else {
        std::cout << "Is not uppercase" << '\n';
    }
    
    return 0;
} 
   
   
   
/*
run:
     
Is uppercase
     
*/

 

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