Merge pull request matthewsamuel95#108 from ozzy80/master

added sum of digits in c

Author: matthewsamuel95

Math/sum_of_digits/sum_of_digits.c

@@ -0,0 +1,24 @@
+#include <stdio.h>
+
+int sum_of_digits(int n){
+	int sum = 0, i, tmp;
+	
+	for(i = 1; i <= n; i++){
+		tmp = i;
+		while(tmp){
+			sum += tmp%10;
+			tmp = tmp/10;
+		}
+	}
+	
+	return sum;
+}
+
+int main(){
+	
+	printf("%d\n", sum_of_digits(5));   //output is 15
+	printf("%d\n", sum_of_digits(12));  //output is 51
+	printf("%d\n", sum_of_digits(328)); //output is 3241
+	printf("%d\n", sum_of_digits(32)); //output is 177
+	return 0;
+}