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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: 21841

## 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("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 author of Program to find least common multiple and greatest common factor of 2 numbers is from United States. Easy Tutor says Hello Friends,I am Free Lance Tutor, who helped student in completing their homework. I have 4 Years of hands on experience on helping student in completing their homework. I also guide them in doing their final year projects.I have share many programs on this website for everyone to use freely, if you need further assistance, than please contact me on easytutor.2ya [at the rate] gmail [dot] comI have special discount scheme for providing tutor services. I am providing tutor service to students from various contries, currently most of my students are from United States, India, Australia, Pakistan, Germany, UK and Canada. I am also here to expand my technical network to receive more opportunity in my career, make friends to help them in resolving their technical problem, learn and share my knowledge, If you like to be my friend, Please send me friend request.Thanks,Happy Programming :) View All Articles

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