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#include<stdio.h>
int main ()
{
    int rows,a,b,space;
    printf("Enter a number of rows:");
    scanf("%d",&rows);
    space=rows-1;
    for(b=space;b>=1;b--)
    {
        for(a=rows;a>=1;a--)
            space--;
        printf("");
        for(a=2*(rows-b)-1;a>=1;a--)
            printf("*",a);
        printf("\n");
        space = space-1;
    }
    getch();
    return 0;
}

prog.c: In function 'main':
prog.c:12:16: warning: zero-length gnu_printf format string [-Wformat-zero-length]
         printf("");
                ^
prog.c:14:20: warning: too many arguments for format [-Wformat-extra-args]
             printf("*",a);
                    ^
prog.c:18:5: warning: implicit declaration of function 'getch' [-Wimplicit-function-declaration]
     getch();
     ^
/home/j96Hzq/ccdUBg1x.o: In function `main':
prog.c:(.text.startup+0x7e): undefined reference to `getch'
collect2: error: ld returned 1 exit status

Standard output is empty