<Codesignal> firstDigit

Easy

Find the leftmost digit that occurs in a given string.

Example

• For inputString = "var_1__Int", the output should be
  firstDigit(inputString) = '1';
• For inputString = "q2q-q", the output should be
  firstDigit(inputString) = '2';
• For inputString = "0ss", the output should be
  firstDigit(inputString) = '0'.

Input/Output

• [execution time limit] 0.5 seconds (c)

• [input] string inputString

  A string containing at least one digit.

  Guaranteed constraints:
  3 ≤ inputString.length ≤ 10.

• [output] char

[C] Syntax Tips

// Prints help message to the console
// Returns a string
char * helloWorld(char * name) {
    char * answer = malloc(strlen(name) + 8);
    printf("This prints to the console when you Run Tests");
    strcpy(answer, "Hello, ");
    strcat(answer, name);
    return answer;
}

---

Solution

char firstDigit(char *inputString)
{
	for(int i=0;i<strlen(inputString);i++)
		if(isdigit(inputString[i]))
			return inputString[i];
}