Day 14 - C (#146)

* Create sum_of_digits.c

* Create product_of_2_numbers.c

* Update README.md

Author: ashwek

day14/C/product_of_2_numbers.c

@@ -0,0 +1,37 @@
+/*
+ * @author: ashwek
+ * @date: 8/1/2019
+ */
+
+#include <stdio.h>
+
+int product(int a, int b){
+
+    if( a == 0 || b == 0 )
+        return 0;
+    else if( a == 1 )
+        return b;
+    else if( b == 1 )
+        return a;
+
+    if( a < 0 && b < 0 )
+        return product(-a, -b);
+    else if( a < 0 )
+        return product(b, a);
+    else
+        return b + product(a-1, b);
+
+}
+
+void main(){
+
+    int a, b;
+
+    printf("Enter 1st number = ");
+    scanf("%d", &a);
+    printf("Enter 2nd number = ");
+    scanf("%d", &b);
+
+    printf("%d x %d = %d\n", a, b, product(a, b));
+
+}

day14/C/sum_of_digits.c

@@ -0,0 +1,24 @@
+/*
+ * @author: ashwek
+ * @date: 8/1/2019
+ */
+
+#include <stdio.h>
+
+int sum(int num) {
+    if( num <= 0 ){
+        return 0;
+    }
+    return (num%10) + sum(num/10);
+}
+
+void main(){
+
+    int num;
+
+    printf("Enter a number = ");
+    scanf("%d", &num);
+
+    printf("Sum of digits = %d\n", sum(num));
+
+}

day14/README.md

@@ -90,6 +90,37 @@ public class SumDigits {
 }
 ```
 
+### C Implementation
+
+#### [Solution](./C/sum_of_digits.c)
+
+```c
+/*
+ * @author: ashwek
+ * @date: 8/1/2019
+ */
+
+#include <stdio.h>
+
+int sum(int num) {
+    if( num <= 0 ){
+        return 0;
+    }
+    return (num%10) + sum(num/10);
+}
+
+void main(){
+
+    int num;
+
+    printf("Enter a number = ");
+    scanf("%d", &num);
+
+    printf("Sum of digits = %d\n", sum(num));
+
+}
+```
+
 <hr />
 
 ## Part B - Product of numbers
@@ -177,4 +208,48 @@ public class Product {
         System.out.println("Product of numbers " + num1 + " and " + num2 + " is: " + recursiveProd(num1, num2));
     }
 }
-```
+```
+
+### C Implementation
+
+#### [Solution](./C/product_of_2_numbers.c)
+
+```c
+/*
+ * @author: ashwek
+ * @date: 8/1/2019
+ */
+
+#include <stdio.h>
+
+int product(int a, int b){
+
+    if( a == 0 || b == 0 )
+        return 0;
+    else if( a == 1 )
+        return b;
+    else if( b == 1 )
+        return a;
+
+    if( a < 0 && b < 0 )
+        return product(-a, -b);
+    else if( a < 0 )
+        return product(b, a);
+    else
+        return b + product(a-1, b);
+
+}
+
+void main(){
+
+    int a, b;
+
+    printf("Enter 1st number = ");
+    scanf("%d", &a);
+    printf("Enter 2nd number = ");
+    scanf("%d", &b);
+
+    printf("%d x %d = %d\n", a, b, product(a, b));
+
+}
+```