Simple calculator using switch...case statement in C programming.

// Simple calculator using switch...case statement in C programming.

# include <stdio.h>
int main()
{
    char o;
    float a,b;
 
     printf("Enter operator either + or - or * or divide : ");
    scanf("%c",&o);
   
    printf("Enter First Value: ");
    scanf("%f",&a);
   
     printf("Enter Second  Value: ");
    scanf("%f",&b);
    switch(o) {
        case '+':
            printf("%.1f + %.1f = %.1f",a, b, a+b);
            break;
        case '-':
            printf("%.1f - %.1f = %.1f",a, b, a-b);
            break;
        case '*':
            printf("%.1f * %.1f = %.1f",a, b, a*b);
            break;
        case '/':
            printf("%.1f / %.1f = %.1f",a, b, a/b);
            break;
        default:
            printf("Error! operator is not correct");
            break;
    }
    return 0;
}

Output :

Finding Prime numbers with c programming

//Finding Prime numbers

#include<stdio.h>

int main(){
   int n, i = 3, count, c;
   printf("Enter the number of prime numbers required:");
   scanf("%d",&n);

   if ( n >= 1 )   {
      printf("First %d prime numbers are :\n",n);
   }
   for ( count = 2 ; count <= n ;  ){
      for ( c = 2 ; c <= i - 1 ; c++ ){
         if ( i%c == 0 )
            break;
      }
      if ( c == i ){
         printf("%d,",i);
         count++;
      }
      i++;
   }
    return 0;
}

Result :

Find LCM of two positive integers with c Programming

//Find LCM of two positive integers with c Programming

#include <stdio.h>
int main()
{
  int i, j, k;
  printf("Enter First positive integers: ");
  scanf("%d", &i);
   printf("Enter First positive integers: ");
  scanf("%d", &j);
  k=(i>j) ? i : j;
  while(1)                  
  {
      if(k%i==0 && k%j==0)
      {
          printf("LCM of %d and %d is : %d", i, j,k);
          break;      
      }
      ++k;
  }
  return 0;
}

Result :

Find Highest Common Factor with C Program .

//greatest common divisor
//Highest Common Factor

//  Find Highest Common Factor with C Program .
#include<stdio.h>

int main(){
int i,j,k,gcd;
printf("Please Enter First Number:");
scanf("%d",&j);
printf("Please Enter Second Number:");
scanf("%d",&k);

for(i=1;i<=j||i<=k;++i){
if(j%i==0&&k%i==0){
gcd=i;
}
}
printf("\nThe greatest common divisor of %d and %d is : %d\n",j,k,gcd);
return 0;
}

Result :

Ascending Number Print with C Programming

//Developed By Muhammad Rakib Hasn

#include<stdio.h>

int main(){
    int i,j,rows;
    printf("Please Enter the Number of Rows:");
    scanf("%d",&rows);

    for(i=1;i<=rows;++i){
        for(j=1;j<=i;++j){
        printf("%d  ",j);
        }
        printf("\n");
    }
return 0;
}

Result :

Descending Decimal Number

//Developed by Muhammad Rakib
//Descending decimal number
#include<stdio.h>

int main(){
    int i,j,rows;
    printf("Please Enter the Number of Rows:");
    scanf("%d",&rows);

    for(i=rows;i>=1;--i){
        for(j=1;j<=i;++j){
        printf("%d  ",j);
        }
        printf("\n");
    }
return 0;
}

Result:

Print Descending Star using C Programming.

//Developed by Muhammad Rakib Hasan

//print descending star 

#include<stdio.h>

int main(){

    int i,j,rows;

    printf("Please Enter the Number of Rows:");

    scanf("%d",&rows);

    for(i=rows;i>=1;--i){

        for(j=1;j<=i;++j){

        printf("*   ");

        }

        printf("\n");

    }

return 0;

}

Result :