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How to convert strings to numbers in C

#include <stdio.h> #include <stdlib.h> #include <string.h> int main(int argc, char* argv[]) { char str[] = "0210"; long int x = strtol(str, NULL, 10); printf("The number is %d\n", x); char str2[] = "210.5"; float y = strtof(str2, NULL, 10); printf("The number is %f\n", y); return 0; }