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Write a program to display “hello world” in C.

``````#include <stdio.h>
int main(){
printf("Hello World");
return 0;
}``````

Write a program to add two numbers (5&7) and display its sum.

``````#include <stdio.h>

int main(){
int a=5,b=7,sum;
sum =a+b;
printf("\nSum of two numbers:%d\n",sum);
return 0;
}``````

Write a program to multiply two numbers (10&8) and display its product.

``````#include <stdio.h>

int main(){
int a=10,b=8,product;
product = a*b;
printf("\nProduct of two numbers is %d",product);
return 0;
}``````

Write a program to calculate the area of a circle having its radius (r=5).

``````#include <stdio.h>
#define PI 3.14

int main(){
float area;
printf("\nArea of circle is %f",area);
return 0;
}``````

Write a program to calculate the area of an ellipse having its axes (minor=4cm, major=6cm).

``````#include <stdio.h>
#define PI 3.14

int main(){
int minor=4,major=6;
float area;
area = PI*minor*major;
printf("Area of an ellipse is %f",area);
return 0;
}``````

Write a program to calculate simple interest for a given P=4000, T=2, R=5.5.

``````#include <stdio.h>

int main(){
int principal = 4000,time=2;
float simple_interest,rate=5.5;
simple_interest = (principal*time*rate)/100;
printf("Simple Interest is %f",simple_interest);
return 0;
}``````

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