Basic-dpp-set/menu driven programs at main · mhjcodes/Basic-dpp-set · GitHub

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program 1


#include<stdio.h>
#include<math.h>
int main()
{
    int n,a;
    printf("1.Factorial of a no\n");
    printf("2.Check even or odd\n");
    printf("3.Area of circle\n");
    printf("4.Sum of first N natural no\n");
    printf("5.Exit\n");
    printf("\nSelect an option:");
    scanf("%d",&n);
   switch(n)
   {
    case 1 :
    int m=1;
    printf("Enter a no");
    scanf("%d",&a);
    while(a)
    {
       m=m*a;
       a--;
    }
    printf("%d",m);
    printf("\n");
    break;
    case 2 :
    int h;
    printf("Enter a no");
    scanf("%d",&h);
    h&1?printf("Odd"):printf("Even");
    printf("\n");
    break;
    case 3 :
    float u;
    printf("Enter radius");
    scanf("%d",&a);
    u= 3.14*a*a;
    printf("Area of circle is %f",u);
    printf("\n");
    break;
    case 4 :
    int r=0;
    printf("Enter a no");
    scanf("%d",&a);
    while(a)
    {
      r=r+a;
      a--;
    }
    printf("%d",r);
    printf("\n");
    break;
    case 5 :
    break;
    default :
    printf("Invalid entry\n\n");
   }
 return 0;
}


program 2


#include<stdio.h>
int main()
{
    while(1)
    {
        int a;
        printf("1.LCM of two nos\n");
        printf("2.Sum of digits of no\n");
        printf("3.Volume of cuboid\n");
        printf("4.Prime no check\n");
        printf("5.Exit\n");
        printf("\nSelect an option:");
        scanf("%d",&a);
    switch(a)
    {
        case 1 :
        int m,n,c;
        printf("Enter two nos");
        scanf("%d %d",&m,&n);
        for((c=m>n?m:n);c<=m*n;c++)
        {
        if(c%m==0 && c%n==0)
        {
            printf("%d",c);
            break;
        }
        }
        printf("\n");
        break;
        case 2 :
        int f=0,h;
        printf("Enter a no");
        scanf("%d",&h);
        while(h)
        {
        f= f+h%10;
        h/=10;
        }
        printf("Sum of digits is %d",f);
        break;
        case 3:
        int v,k,j,d;
        printf("Enter three side lengths");
        scanf("%d %d %d",&k,&j,&d);
        v=k*j*d;
        printf("Volume of cuboid is %d",v);
        printf("\n");
        break;
        case 4:
        int t,e;
        printf("Enter no");
        scanf("%d",&t);
        for(e=2;e<=t-1;e++)
        {
        if(t%e==0)
        {
            printf("Not a prime no");
            break;
        }
        }
        if(e==t)
        printf("Prime no");
        printf("\n");
        case 5 :
        break;
        default :
        printf("\nInvalid entry");
    }
    }
   return 0;
}