I'm very new to c and everything in general. I dont understand why my code doesn't work:

#include <cstdio>

int main(){
 
int a;

scanf("%d", &a);

for(int i = 1; i < a; i  ){
 printf(" ");

}

printf("*");

}

what I'm trying to do is make the number of spaces as the value inputted by the user minus and add a * at the end so if a = 10 :

     *

but when I try it the spaces don't show. Ideally what I'm trying to do is get an output something like:

   *
  **
 ***
****

The length depends on user input if it was 10 then the spaces would be 9 and the * at the end would be the tenth.

CodePudding user response：

And for the syntactic part:

1. scanf("%d" &a); should be scanf("%d", &a);

explanation: missing comma (,)

2. print(" ") should be printf(" ");

explanation: print should be printf and missing semicolon (;)

3. print("*") should be printf("*");

explanation: print should be printf and missing semicolon (;)

4. And lastly try including return 0; at end of every code in main() function.

And for the logical part: You will have to use 3 for-loops (two of them nested inside one). The parent for loop for each row. And the nested two are for spaces and stars.

#include <cstdio>
int main()
{

    int a;

    scanf("%d", &a);

    for(int i=1; i<a; i  )
    {
        for(int j=i; j<a; j  )
            printf(" ");
        for(int k=0; k<i; k  )
            printf("*");

        printf("\n");
    }
    return 0;
}

You will get your desired output if you put the value 5 for a, i.e., a=5.

To learn more in detail, you can follow this link star patterns in c

Your code may contain many errors. That's understandable, cause you are to new C/C . Try problem-solving in beecrowd to learn in a better way. These errors will automatically go away day by day as you progress. But the secret is to practice and never give up. Good luck!