#Using scanf function in my code

20 messages · Page 1 of 1 (latest)

vital forge
#

I am a beginner and need help in adding scanf feature in my code

Here is the code :

// Create an array of size 3 x 10 containing multiplication tables of the numbers 2,7 and 9 respectively.

#include <stdio.h>

int t[3][10], n[] = {2, 7, 9}; // t is a 3 x 10 array and n is an array of size 3

void fill(int i, int j) {
if (i == 3) return; // Index out of bounds
t[i][j] = n[i] * (j + 1);
fill(i + (j == 9), (j + 1) % 10);
}

void print(int i, int j) {
if (i == 3) return;
if (j == 0) printf("Table of %d:\n", n[i]);
printf("%d x %d = %d\n", n[i], j + 1, t[i][j]);
print(i + (j == 9), (j + 1) % 10);
}

int main() {
fill(0, 0);
print(0, 0);
return 0;
}

I wanted to make the code as shortest as possible therefore i have used recursion, and now i want to advance it by using scanf function to take input from the user.
I’d really appreciate help on how to:

  • Replace the hardcoded n[] with user input using scanf.
  • Make sure the recursion still works with that change.
radiant remnantBOT
#

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static grove
radiant remnantBOT
#

I am a beginner and need help in adding scanf feature in my code

Here is the code :

// Create an array of size 3 x 10 containing multiplication tables of the
// numbers 2,7 and 9 respectively.

#include <stdio.h>

int t[3][10],
    n[] = {2, 7, 9};  // t is a 3 x 10 array and n is an array of size 3

void fill(int i, int j) {
  if (i == 3)
    return;  // Index out of bounds
  t[i][j] = n[i] * (j + 1);
  fill(i + (j == 9), (j + 1) % 10);
}

void print(int i, int j) {
  if (i == 3)
    return;
  if (j == 0)
    printf("Table of %d:\n", n[i]);
  printf("%d x %d = %d\n", n[i], j + 1, t[i][j]);
  print(i + (j == 9), (j + 1) % 10);
}

int main() {
  fill(0, 0);
  print(0, 0);
  return 0;
}

I wanted to make the code as shortest as possible therefore i have used recursion, and now i want to advance it by using scanf function to take input from the user.
I’d really appreciate help on how to:

  • Replace the hardcoded n[] with user input using scanf.
  • Make sure the recursion still works with that change.
Akemi
Formatted by sbdswr /good orc is dead orc/
static grove
#

I wanted to make the code as shortest as possible therefore i have used recursion
that looks like a false presumption

#

plus makes your code quite hard to read and reason about

#

while it would be just three lines in function when used with nested for

#

it is really interesting thinking with your recursion here, I mean some algorithms are naturally comfortably presented by recursion, but this is an extremely reversed case :)

#

for is the most obvious choice for visiting an array

#

so my recommendation is to rewrite your logic into using loops, and then the functions can e.g. accept dimensions as input

#

and guessing that this isn't really code-golfing, then:

int t[3][10];
int n[] = {2, 7, 9};  // t is a 3 x 10 array and n is an array of size 3

is rather widely preferred style

vital forge
#

Yeah you’re totally right. I am new to coding and it’s been just a couple of weeks since I started learning C, so I’ve been experimenting with different styles and just playing around with recursion a bit.

#

like this?


#include <stdio.h>

#define ROWS 3
#define COLS 10

int main() {
    int t[ROWS][COLS];
    int n[ROWS];
    
    printf("Enter 3 numbers to generate their multiplication tables:\n");
    for (int i = 0; i < ROWS; i++) {
        printf("Enter number %d: ", i + 1);
        scanf("%d", &n[i]);
    }

    // Fill the tables
    for (int i = 0; i < ROWS; i++) {
        for (int j = 0; j < COLS; j++) {
            t[i][j] = n[i] * (j + 1);
        }
    }

    // Print the tables
    for (int i = 0; i < ROWS; i++) {
        printf("\nTable of %d:\n", n[i]);
        for (int j = 0; j < COLS; j++) {
            printf("%d x %d = %d\n", n[i], j + 1, t[i][j]);
        }
    }

    return 0;
}```
desert vigil
#

You can post your code with highlighting using backticks '`'. Just modify the code you posted above.

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vital forge
radiant remnantBOT
#

@vital forge Has your question been resolved? If so, type !solved :)

static grove
vital forge
vital forge
#

!solved