helo am c devloper

gistfile1.c

#include <stdio.h>
#include <ctype.h>

int main() {

    printf("Please enter your name\n");
    char yourName[20];
    scanf("%s", yourName);

    char firstChar = yourName[0];

    if (firstChar >= 'a' && firstChar <= 'z') {
        yourName[0] = (char) toupper(firstChar);
    }

    printf("What year were you born?\n");
    int year = 0000;
    scanf("%d", &year);

    if (year < 1900 || year > 2017) {
        printf("Don't lie to me, %s", yourName);
        return 0;
    }

    int calculatedAge = 2017 - year;

    printf("Well, %s, according my calculations you are %d-%d years old.", yourName, calculatedAge - 1, calculatedAge);

    return 0;

}