C program to print a character pattern using pointers

#include<stdio.h>
main()
{
char a[20],*ptr;
int x,y;
printf("Enter any string\n");
scanf("%s",a);
printf("\nThe name is %s",a);
x=0;
while(x<=strlen(a))
{
printf("\n");
ptr=a;
for(y=0;y<x;y++)
{
printf("%c",*ptr);
ptr++;
}
x++;
}
}

C program to print diamond pattern

#include<stdio.h>

main()
{
int i,n,j,x;
printf("Enter a Number:");
scanf("%d",&n);
for(i=0;i<n;i++)
{
for(x=0;x<n-i;x++)
{
printf("\t");
}
for(j=0;j<=i;j++)
{
printf("*\t\t");
}
printf("\n\n");
}
for(i=1;i<n;i++)
{
printf("\t");
for(x=1;x<=i;x++)
{
printf("\t");
}
for(j=n;j>i;j--)
{
printf("*\t\t");
}
printf("\n\n");
}
}