C and scanf

[pallid cave]

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@warped harness

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[warped harness]

Hello,

does someone know why my code does not ask for any input despite of the "scanf" ?

Thanks !

#include <stdio.h>
#include <stdlib.h>

int main(){

   char letter;
   int nbLignes;
   int occurrences = 0;
   
   scanf("%c", &letter);
   scanf("%d", &nbLignes);
   
   
   
   for(int i=1;i<=nbLignes;i++){
      char ligne[1001];
      scanf("%[^\n]\n", ligne);
      for (int j=0;ligne[j]!='\0';j++){
         if (ligne[j] == letter){occurrences++;}
      }
   }
   printf("%d", occurrences);
   return 0;
}

[inner marlin]

every once in a while this always pops up

[warped harness]

how can I avoid this issue ?

[inner marlin]

you can make your scanf line like this:
scanf(" %d", &nbLignes);

here is a blog post I wrote about this issue that is common with beginners using scanf

[warped harness]

but that does not recup the string

no ?

[inner marlin]

https://raynei.dev/why-avoid-scanf-as-a-beginner/

[inner marlin]

?

[warped harness]

Okk thank, i'm gonna read that now

[warped harness]

%d isn't used to recup int inputs ?

[inner marlin]

it is

just look at the first half of my post

it explains why your problem occurs

[warped harness]

"After scanf reads in the number, the newline character stays . . . " what is "the new line character" ?

like

when i scanf my int

it does not go to the next line ?

[inner marlin]

for now you can understand newline as "when you press the enter key"

[warped harness]

Okk i see

i understand, tyvm for your help !

[inner marlin]

[warped harness]

!solved