ham nguyen to lon nhat

// nhap n 0<n<1000, viet ham tim so nguyen to lon nhat tu 1 den n

#include<stdio.h>

#include<conio.h>

#include<math.h>

int ngto_lonnhat(int n, int i, int j, int dem, int max);

int ngto_lonnhat(int n, int i, int j, int dem, int max)

{

max = 0;

for(i=1; i<=n; i++){

dem = 0;

for (j=1; j<=i;j++){

if (i%j==0)

dem++;

}

if (dem==2)

{

if (i>max)

max=i;

} }

return max;

}

int main()

{

int n,i,j,dem,max;

do

{

printf("Nhap n = "); scanf("%d",&n);

}

while (n<1 || n>999);

max = ngto_lonnhat(n,i,j,dem,max);

printf("So nguyen to lon nhat tu 1 den %d la: %d",n,max); return 0;

}