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C++ Reference: getenv()
getenv()
Declaration
char* getenv(const char* kcpEnvVarName);
Description
Retrieve the value of an environment variable. The parameter pointed to by the null-terminated string "kcpEnvVarName" is the name of the environment variable. The return value is its environment variable's value as a null-terminated string or NULL if the variable is undefined.
Example
#include <iostream>
#include <cstdlib>
int main() {
using namespace std;
char caEnvVarName[] = "SomeVariableName";
char* cpEnvVarValue = getenv(caEnvVarName);
if (cpEnvVarValue == 0) {
cout << "Environment variable \"" << caEnvVarName
<< "\" does not exist." << endl;
} else {
cout << "Environment variable \"" << caEnvVarName
<< "\" = " << cpEnvVarValue << endl;
}
return 0;
}
Output:
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