User inputs a number, and program should surround it with charatchers - c

Question

This is my code, it works but i feel i could do something different
#include <stdio.h>
int main()
{
int n;
printf("Input a number [0,9]: ");
scanf("%d", &n);
printf("*****\n");
printf("*****\n");
printf("**%d", n);
printf("**");
printf("\n*****\n");
printf("*****\n");
return 0;
}
Is this the best solution or is there something easier?

Answer 1

I tend to do 1 printf() per output line
#include <stdio.h>
#include <stdlib.h>
int main(void)
{
int n;
printf("Input a number [0,9]: ");
if (scanf("%d", &n) != 1) exit(EXIT_FAILURE);
if ((n < 0) || (n > 9)) printf("nope\n");
else {
printf("*****\n");
printf("*****\n");
printf("**%d**\n", n);
printf("*****\n");
printf("*****\n");
}
return 0;
}
#include <stdio.h>
#include <stdlib.h>
int main(void)
{
int n;
printf("Input a number [0,9]: ");
if (scanf("%d", &n) != 1) exit(EXIT_FAILURE);
if ((n < 0) || (n > 9)) printf("nope\n");
else {
for (int i = 0; i < 5; i++) {
if (i == 2) {
printf("**%d**\n", n);
} else {
printf("*****\n");
}
}
}
return 0;
}

Answer 2

you can do it a bit more universal way. It will print NCHARS around the number and NLINES lines of FILLER around the number. Any number is covered (including negave ones)
#include <stdio.h>
#define NCHARS 3
#define NLINES 3
#define FILLER '*'
size_t countdigits(int n)
{
size_t ndigits = n <= 0 ? 1 : 0;
while(n)
{
ndigits++;
n /= 10;
}
return ndigits;
}
void printlines(size_t nchars, char ch)
{
for(size_t before = 0; before < NLINES; before++)
{
for(size_t pos = 0; pos < nchars; pos++ )
printf("%c", ch);
printf("\n");
}
}
void printfsurrounded(int n)
{
size_t nchars = countdigits(n);
printlines(nchars + NCHARS * 2, FILLER);
for(int pos = 0; pos < NCHARS; pos++) printf("%c", FILLER);
printf("%d", n);
for(int pos = 0; pos < NCHARS; pos++) printf("%c", FILLER);
printf("\n");
printlines(nchars + NCHARS * 2, FILLER);
}
int main(void)
{
printfsurrounded(4);
printf("\n");
printfsurrounded(1024);
printf("\n");
printfsurrounded(-233445);
}
https://godbolt.org/z/hz1eq9