Create Program to check for prime number

C/Floyd's triangle

@@ -0,0 +1,15 @@
+//Program to print floyd's triangle using numbers
+#include <stdio.h>
+void main()
+{
+	int i=0,j=0,c=1;
+	for(i=1;i<=4;i++)
+	{
+		for(j=1;j<=i;j++)
+		{
+		    printf("%d ",c);
+		    c++;
+		}
+		printf("\n");
+	}
+}

C/Pascal's triangle

@@ -0,0 +1,30 @@
+//Program to print pascal's triangle
+#include <stdio.h>
+void main()
+{
+	printf("Enter height of pascal's triangle:");
+	int n=0,i,j;
+	scanf("%d",&n);
+	for(i=0;i<n;i++)
+	{
+		for(j=1;j<n-i;j++)
+		printf("  ");
+		for(j=0;j<=i;j++)
+		{
+			printf("%d  ",coff(i,j));
+		}
+		printf("\n");
+	}
+}
+int coff(int a,int b)
+{
+	int r=fac(a)/(fac(b)*fac(a-b));
+	return r;
+}
+int fac(int a)
+{
+	int i,f=1;
+	for(i=1;i<=a;i++)
+	f=f*i;
+	return f;
+}

C/Program to check for prime number

@@ -0,0 +1,17 @@
+//Program to check prime number
+#include <stdio.h>
+void main()
+{
+   int n=0,i=0,c=0;
+   printf("Enter a number");
+   scanf("%d",&n);
+   for(i=1;i<=n;i++)
+   {
+      if(n%i==0)
+      c++;
+    }
+    if(c==2)
+    printf("%d is aprime number",n);
+    else
+    printf("%d is aprime number",n);
+}