C Program to find area of circle, triangle and square

C Program to find area of circle, triangle and square  | Area of circle in C | Area of triangle in C


#include
#include
#include
main()
{
int n1;
int sum;
int a,b,c;
char y,s;

printf("Enter Operation To be Used: \n");
printf("(1=circle   2=Triangle   3=Square): ");
scanf("%d",&n1);



float pi;

switch(n1)
{
case 1:

float rad;
printf("\n\nArea Of a Circle!");
printf("\nEnter radius: ");
scanf("%f",&rad);

float areac;
areac = (3.14) * (rad * rad);

printf("The Area of a circle is %.2f",areac);
break;  




case 2:          

int base,he,areat;

printf("\n\nArea Of a Triangle!");
printf("\nEnter base: ");
scanf("%d",&base);
printf("Enter height: ");
scanf("%d",&he);

areat = (base * he)/(2);

printf("The Area of a triangle is %d",areat);
break;




case 3:     
int side,areas;
printf("\n\nArea Of a Square!");
printf("\nEnter side: ");
scanf("%d",&side);


areas = side * side;

printf("The Area of a Square is %d",areas);
break;
}        
if(n1>=4)
{
printf("\nInvalid Input!");

}      

printf("\n\nPress Y to repeat and N to end:\n");
scanf("%s",&s);
if(s=='y'){
system ("cls");
return main();        
getch();
}

if (s=='y')
{
return 0;
}}




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