new snippet - swap numbers

snippets/c/mathematical-functions/swap-numbers.md

@@ -0,0 +1,19 @@
+---
+title: Swap numbers
+description: Swaps two numbers without using third variable
+author: Emosans
+tags: swap,numbers
+---
+
+```c
+#include<stdio.h>
+void swap(int* num1,int* num2){
+ *num1= *num1 + *num2;
+ *num2= *num1 - *num2;
+ *num1= *num1 - *num2;
+}
+
+// Usage:
+int a=3,b=4;
+auto swapped=swap(&a,&b); // simply use printf after this to print swapped values
+```