C++中atoll函数的使用示例有哪些

将字符串转换为长整型数值：

#include <iostream>#include <cstdlib>int main() {    const char* str = "1234567890";    long long num = atoll(str);        std::cout << "Converted number: " << num << std::endl;        return 0;}

#include <iostream>#include <cstdlib>int main() {    const char* str = "-9876543210";    long long num = atoll(str);        std::cout << "Converted number: " << num << std::endl;        return 0;}

#include <iostream>#include <cstdlib>int main() {    const char* str = "abcd1234";    char* endptr;    long long num = atoll(str);        if (*endptr != '\0') {        std::cerr << "Error converting string to long long" << std::endl;    } else {        std::cout << "Converted number: " << num << std::endl;    }        return 0;}