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#include <stdio.h>
/* global variable declaration */
int z;
int main()
{
/* local variable declaration */
int x, y;
/* actual initialization*/
x = 10;
y = 20;
z = x + y; //make addition and store into 'z'
printf("Value of x = %d\nValue of y = %d\n\nAddition of x + y = %d",x,y,z);
return 0;
}