Basic Programs

Sum of two numbers

/*    Sum of two Variable    */

#include<stdio.h>

 int main()

 {

  int var2;

  int var1;

  int var3;

  printf("Type your frist value to add : ");

   scanf("%i",&var1);

  printf("Type your second value to add : ");

   scanf("%i",&var2);

  var3 =var2+var1;

   printf("Total of your value =  %i",var3);

  return 0;

 }

Calculate Simple Interest

/*    Calculate Simple interest    */
#include<stdio.h>
int main()
{
 float p;
 float ir,t;
 float in;

  printf("Type your principle amount : ");
  scanf("%f",&p);
  printf("\n Type your rate of intrest : ");
  scanf("%f",&ir);
  printf("\n Type time (in year) : ");
  scanf("%f",&t);
  in=p*ir*t/100;
  printf("\n You will get intrest : %.2f",in);
 return 0;
}

Convert Km to Meter, Centimeter or Millimeter

/*    Convert Km to Meter, Centimeter or Millimeter    */
#include<stdio.h>
int main()
{
 float km;
 char v;
 float ans;

 printf("K.M. : ");
 scanf("%f",&km);
 printf("KM will be changed in (M,s,m) : ");
 fflush(stdin);
 scanf("%c",&v);
 if(v=='M')
  ans=km*1000;
 if(v=='s')
  ans=km*100000;
 if(v=='m')
  ans=km*1000000;
 printf("Answer : %.2f",ans);
 return 0;
}

Swap values of two Variables

/*    Swap the values of two Variables using three variables    */
#include<stdio.h>
int main()
{
 int a;
 int b;
 int c;

 printf("Type value of A : ");
 scanf("%i",&a);
 printf("\nType value of b : ");
 scanf("%i",&b);
 c=a;
 a=b;
 b=c;
 printf("A : %i",a);
 printf("\nb : %i",b);
 return 0;
}

Swap two values without using third variable

/*    Swap the values of two variables without using third variable   */

#include<stdio.h>

int main()
{
 int a;
 int b;
 printf("Type value of A : ");
 scanf("%i",&a);
 printf("\nType value of b : ");
 scanf("%i",&b);
  a = a + b;
  b = a - b;
  a = a - b ;
 printf("A : %i",a);
 printf("\nB : %i",b);
 return 0;
}

Swap values of two variables using XOR

/* Swap values of two variables using XOR */

#include<stdio.h>

int main()
{
 int a;
 int b;
 printf("Type value of A : ");
 scanf("%i",&a);
 printf("\nType value of b : ");
 scanf("%i",&b);
  a ^= b;
  b ^= a;
  a ^= b;
 printf("A : %i",a);
 printf("\nB : %i",b);
 return 0;
}

Convert meter to feet

/* convert meter to feet */

#include<stdio.h>
int main()
{
    float m,f;
    printf("Type meter : ");
    scanf("%f",&m);
    f = 3.2808399 * m;
    printf("feets: %f",f);
    return 0;
}

Convert feet to meter

/* convert feet to meter */

#include<stdio.h>
int main()
{
    float m,f;
    printf("Type feet : ");
    scanf("%f",&f);
    m = f / 3.2808399;
    printf("meter: %f",m);
    return 0;
}

Convert celcius to farenheit

/* convert celcius to farenheit */

#include<stdio.h>
int main()
{
    float c,f;
    printf("Type celcius: ");
    scanf("%f",&c);
    f = c * 9/5 + 32;
    printf("farenheit: %f",f);
    return 0;
}