C Language Print the arguments to a program and convert to integer values


Example

The following code will print the arguments to the program, and the code will attempt to convert each argument into a number (to a long):

#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <limits.h>

int main(int argc, char* argv[]) {

    for (int i = 1; i < argc; i++) {
        printf("Argument %d is: %s\n", i, argv[i]);

        errno = 0;
        char *p;
        long argument_numValue = strtol(argv[i], &p, 10);

        if (p == argv[i]) {
            fprintf(stderr, "Argument %d is not a number.\n", i);
        }
        else if ((argument_numValue == LONG_MIN || argument_numValue == LONG_MAX) && errno == ERANGE) {
            fprintf(stderr, "Argument %d is out of range.\n", i);
        }
        else {
            printf("Argument %d is a number, and the value is: %ld\n",
                   i, argument_numValue);
        }
    }
    return 0;
}

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