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INTERVIEW QUESTIONS PROGRAMMING LANGUAGES C DETAILS
Question :

How to find GCD of four numbers?

Posted by: vinayak on 3/29/2014

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Category C Interview Questions
Rating (3.8) By 46 users
Added on 3/29/2014
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Answers:

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Take 4 numbers.The smallest number has to be found out.Then divide each number by that numbers which are less than that smallest number.
e.g.5,15,75,20
smallest-5
so divide each numbers by 1,2,3,4,5.
The GCD will be that number which divides all the number.(here 5)
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Posted by: prasenjit

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Global coding data
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Posted by: saumya

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#include<stdio.h>
void main()
{
int a,b,c,d,i,gcd;
printf("Enter Number 1");
scanf("%d",a);
printf("Enter Number 2");
scanf("%d",b);
printf("Enter Number 3");
scanf("%d",c);
printf("Enter Number 4");
scanf("%d",d);
for(i=1;i++;)
{
if((n%a==0)&&(n%b==0)&&(n%c==0)&&(n%d==0)
{break;}
)
lcm = ((a*b*c*d)/i);
}

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Posted by: Aj

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#include<stdio.h>
main()
{
int a,b,l;
clrscr();
printf("/nEnter nos:");
scanf("%d%d",&a,&b);
l=gcd(a,b);
printf("GCD=%d",l);
getch();
}
gcd(int a,int b)
{
int c=0;
while(1)
{
c=a%b;
if(c==0)
return b;
a=b;
b=c;
}
}
o/p:

Enter nos:200 800
GCD=200

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Posted by: AnuradhaSrikanth

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#include<stdio.h>
int main(void)
{
int a,b,c,d,i,r1,r2,r3,r4,lst,gcd;
printf(" Enter The Numbers");
scanf("%d %d %d %d", &a,&b,&c,&d);
lst=a;
if(b<lst)
lst=b;
if(c<lst)
lst=c;
if(c<lst)
lst=d;
for(i=2;i<=lst;i++)
{
r1=a%i;
r2=b%i;
r3=c%i;
r4=d%i;
if(r1==0 && r2==0 &&r3==0 && r4==0)
gcd=i;
else
gcd=1;
}
printf("GCD=%d ", gcd);
return 0;
}

one back log of this program is that you cant use negetive numbers
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Posted by: debdeep

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#include<stdio.h>
#include<conio.h>
struct gcd
{
int n;
int b[100][10];
}k[4];
void main()
{
int a=0,i=0,m=0,z=0,v=1;
int j[4],l[4],x,y;
clrscr();
for(a=0;a<4;a++)
{
printf("Enter the value");
scanf("%d",&k[a].n);
m=k[a].n;
j[a]=0;
l[a]=0;
for(i=2;i<=m;i++)
{
while(m%i==0)
{
m=m/i;
k[a].b[l[a]][j[a]]=i;
j[a]=j[a]+1;
}
j[a]=0;
l[a]=l[a]+1;
}
printf(" ");
}
for(x=0;x<10;x++)
{
for(y=0;y<10;y++)
{
if(k[0].b[x][y]&&k[1].b[x][y]&&k[2].b[x][y]&&k[3].b[x][y])
{
printf(" common value are: %d",k[0].b[x][y]);
v=v*k[0].b[x][y];
}
}
}
printf(" gcd value is: %d",v);
getch();
}
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Posted by: venkat

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what is this?????????
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Posted by: man

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Source: CoolInterview.com

1. First find out factors for the smallest number.
2. Which factors of smallest number gives reminder zero when divisible each factor with each number.
3. Take the common factors from four numbers and multiply them
4.Then you get Gcd.




ph no:+917842233607
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Posted by: rajasekharreddy.bhumireddy

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