Sample C Prog. For Calculator operations

#include
#include
#include
void main()
{
int a,m;
clrscr();
do
{
printf("\n\nEnter the choice what u want to do?\n");
printf("1.Addition\n2.Substractions\n3.Multiplication\n4.Division\n5.Power\n6.Souare Root\n");
scanf("%d",&a);
switch(a)
{
case 1:
{
int num1,num2,sum;
printf("Enter the 2 nos.::\n");
scanf("%d%d",&num1,&num2);
sum=num1+num2;
printf("Sum=%d",sum);
}break;
case 2:
{
int num3,num4,diff;
printf("Enter the 2 nos.::\n");
scanf("%d%d",&num3,&num4);
diff=num3-num4;
printf("Difference = %d",diff);
}break;
case 3:
{
int num5,num6,prdct;
printf("Enter the 2 nos.::\n");
scanf("%d%d",&num5,&num6);
prdct=num5*num6;
printf("Product = %d",prdct);
}break;
case 4:
{
float num7,num8,div;
printf("Enter the 2 nos.::\n");
scanf("%f%f",&num7,&num8);
div=num7/num8;
printf("Division = %f",div);
}break;
case 5:
{
float num9,num10,power;
printf("Enter the 2 nos.::\n");
scanf("%f%f",&num9,&num10);
power=pow(num9,num10);
printf("value of power=%f",power);
}break;
case 6:
{
float num11,srt;
printf("Enter the no::");
scanf("%f",&num11);
srt=sqrt(num11);
printf("square root of no. = %f",srt);
}break;
}
printf("\n\nWanna do more Calculations...\n1.yes\n2.no\n::");
scanf("%d",&m);
}
while(m==1);

getch();
}