I'm learning C++ for school and I'm confused on how to integrate command line arguments into my code
int n = 1;
int c = 0;
n = argv[1];
c = int(argv[2]);
findPrimes(n, c);
return 0;
}
That's my main function so far, but n = argv[1]; is a type error, and c = int(argv[2]); is a loss of data error. I know I'm rather far off, so any help to both improve my question and solve my problem is appreciated.
To convert a char*
string into an int
, you can use the C library atoi()
, sscanf()
or other equivalent function:
#include <cstdlib>
int n = std::atoi(argv[1]);
#include <cstdlib>
int n;
std::sprintf(argv[1], "%d", &n);
Or, you can use the C++ std:stoi()
function:
#include <string>
int n = std::stoi(argv[1]);
Or, the std::istringstream
stream class:
#include <sstream>
int n;
std::istringstream(argv[1]) >> n;
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