/********************************

* This is the first Program

* first.c

* Compile: cc -Wall first.c

********************************/

#include <stdio.h>

int main()

{

printf("Tamaso Ma Jyotir Gamaya\n") ;

return 0 ;

}

/*********************************

* Second program: second.c

* Compile: cc -Wall second.c

*********************************/

#include <stdio.h>

int main() {

int n ;

printf("Enter a non Negative integer: ") ;

scanf("%d", &n) ; /* Reads an integer */

printf("\nSum of (0 + ... + %d) = %d\n", n, n*(n + 1)/2 ) ;

return 0 ;

} // second.c

/*****************************************

* Third program: third.c

* Area of a Circle:

* Compile: cc -Wall -lm third.c

*****************************************/

#include <stdio.h>

#include <math.h>

int main() {

float radius, area ;

printf("Enter the radius :") ; scanf("%f", &radius) ;

area = 4.0 * atan(1.0) * radius * radius ;

printf("\n Circle-Area = %f for Radius = %f\n", area, radius) ;

return 0 ;

} // third.c

/******************************************

* Convert Fahrenheit to Celsius: fourth.c

******************************************/

#include <stdio.h>

int main(){

float cel, fah ;

printf("Enter temp. in F: ") ;

scanf("%f", &fah) ;

cel = 5.0*(fah-32.0)/9.0 ;

printf("%6.2f F = %6.2f C\n", fah, cel) ;

return 0 ;

}

/*************************************

* Fifth program: fifth.c

* ***********************************/

#include <stdio.h>

int main() {

int first, second, max ;

printf("Enter two integers :") ;

scanf("%d%d", &first, &second) ;

if(first > second) max = first ;

else max = second ;

printf("\nMax(%d,%d) = %d\n", first, second, max) ;

return 0 ;

}

/************************************

* Sixth: sixth.c

************************************/

#include <stdio.h>

int main() {

int n, i, sum = 0 ;

printf("Enter a non-negative integer:") ;

scanf("%d", &n) ;

for(i = 0; i <= n; ++i) sum += i ;

printf("\nSum of (0 + ... + %d) = %d\n", n, sum ) ;

return 0 ;

}