(Where user entered number through keyboard, for example if num=5).
1
12
123
1234
12345
Ans.
/*c program for number triangle pyramid*/
#include<stdio.h>
#include<conio.h>
int main()
{
int num,r,c,sp;
printf("Enter loop repeat number(rows): ");
scanf("%d",&num); for(r=1; num>=r; r++)
{
for(sp=num-r; sp>=1; sp--)
printf(" ");
for(c=1; c<=r; c++)
printf("%d",c);
printf("\n");
} getch();
return 0;
} /*************OUTPUT****************Enter...