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Program to find least common multiple and greatest common factor of 2 numbers

Posted By: Easy Tutor     Category: C Programming     Views: 8899

Write a program that finds least common multiple and greatest common factor of 2 numbers.

Code for Program to find least common multiple and greatest common factor of 2 numbers in C Programming

#include <stdio.h>
#include <conio.h>
#include <math.h>

int num1,num2,choice,temp1,temp2;

void lcm(){
      int i,lcm=1;
      num1 = temp1;
      num2 = temp2;
      printf("\n\nL.C.M OF NUMBER\n");
      while(num1>1 || num2>1){
        for(i=2;i<100;i++){
        if(num1%i==0 || num2%i==0){
        printf("\n%4d | %4d ,  %4d",i,num1,num2);
        if(num1%i==0){
            num1     = num1/i;
         }
        if(num2%i==0){
            num2     = num2/i;
        }
        lcm = lcm * i;
        }
          }
    }
    printf("\nÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ");
    printf("\n%4d | %4d ,  %4d",lcm,1,1);
    printf("\n\nLCM IS %d",lcm);
}

void gcf(){
      int i,gcfnum1=1,gcfnum2=1,cntnum1[100]={0},cntnum2[100]={0},gcf=1;
      num1 = temp1;
      num2 = temp2;
      printf("G.C.F. OF NUMBER\n");
      //For num1while(num1>1){
        for(i=2;i<100;i++){
        if(num1%i==0){
        printf("\n%4d | %4d ",i,num1);
        num1     = num1/i;
        gcfnum1 = gcfnum1 * i;
        cntnum1[i]++;
        }
          }
    }
    printf("\nÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ");
    printf("\n%4d | %4d ",gcfnum1,1);
    printf("\nGCF IS %d",gcfnum1);
    printf("\n%-4d  =  ",temp1);
    for(i=2;i<100;i++){
        if(cntnum1[i]>0)
           printf(" (%3d^%-3d) ",i,cntnum1[i]);
    }


    //For num2
    printf("\n\n");
    while(num2>1){
        for(i=2;i<100;i++){
        if(num2%i==0){
        printf("\n%4d | %4d ",i,num2);
        num2     = num2/i;
        gcfnum2 = gcfnum2 * i;
        cntnum2[i]++;
        }
          }
    }
    printf("\nÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ");
    printf("\n%4d | %4d ",gcfnum2,1);
    printf("\n\nGCF IS %3d",gcfnum2);
    printf("\n%-4d  =  ",temp2);
    for(i=2;i<100;i++){
        if(cntnum2[i]>0)
           printf(" (%3d^%-3d) ",i,cntnum2[i]);
    }

    //GCF logicfor(i=2;i<100;i++){
         if(cntnum1[i]==0 || cntnum2[i]==0)
        continue;
         elseif(cntnum1[i]<cntnum2[i])
        gcf = gcf * pow(i,cntnum1[i]);
         elseif(cntnum2[i]<cntnum1[i])
        gcf = gcf * pow(i,cntnum2[i]);
         elseif(cntnum1[i]>0)
        gcf = gcf * pow(i,cntnum1[i]);
         elseif(cntnum2[i]>0)
        gcf = gcf * pow(i,cntnum2[i]);
    }

    printf("\n\nGCF of  %d  and  %d  is  %d",temp1,temp2,gcf);
}

void main(){
    void lcm(void);
    void gcf(void);
    clrscr();
    printf("*****LCM And GCF of Given Numbers*****");
    up:
    printf("\n\nEnter num1 : ");
    scanf("%d",&num1);
    printf("Enter num2 : ");
    scanf("%d",&num2);
    temp1 = num1;
    temp2 = num2;
    while(1){
    clrscr();
    printf("\n\nChoose your Choice\n");
    printf("1)  L.C.M\n");
    printf("2)  G.C.F\n");
    printf("3)  Scan New Numbers\n");
    printf("4)  Exit\n");
    printf("Enter your choice : ");
    scanf("%d",&choice);
    switch(choice){
        case 1 : clrscr();
             lcm();
             break;
        case 2 : clrscr();
             gcf();
             break;
        case 3 : goto up;
        case 4 :
             exit(1);
        default: printf("\n\nINVALID CHOICE\n");
    }
       getch();
      }
}
  
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Easy Tutor
Easy Tutor author of Program to find least common multiple and greatest common factor of 2 numbers is from United States. Easy Tutor says

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