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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include <math.h>
  4. #include <string.h>
  5.  
  6. #define tam_max 256
  7.  
  8. int recebe(char principal[tam_max]) {
  9.     int erro = 0;
  10.     setbuf(stdin, NULL);
  11.     fgets(principal, tam_max, stdin);
  12.     for (int i = 0; i < strlen(principal); i++) {
  13.         if (principal[0] == '\n') {
  14.             erro++;
  15.         } else if ( principal[i] == '+' || principal[i] == '-' ||
  16.             principal[i] == '*' || principal[i] == '/' ||
  17.             principal[i] == '=' || principal[i] == '^' ||
  18.             principal[i] == 'i' || principal[i] == 'p' ||
  19.             principal[i] == '0' || principal[i] == '1' ||
  20.             principal[i] == '2' || principal[i] == '3' || 
  21.             principal[i] == '4' || principal[i] == '5' || 
  22.             principal[i] == '6' || principal[i] == '7' ||
  23.             principal[i] == '8' || principal[i] == '9' || principal[i] == '\n') {
  24.             erro = 0;
  25.         } else {
  26.             erro++;
  27.         }
  28.     } 
  29.     return erro;
  30. }
  31.  
  32. void divide() {
  33.     printf("OK ate aqui\n");
  34. }
  35.  
  36. void validaDados() {
  37.     int verifica = 0;
  38.     char principal[tam_max];
  39.     verifica = recebe(principal);
  40.     printf("%s\n", principal);
  41.     if (verifica > 0) {
  42.         printf("\nCaracteres invalidos inseridos. Por favor, tente novamente.\n\n");
  43.         validaDados();
  44.     }
  45.     if (verifica == 0) {
  46.         divide();
  47.     }
  48. }
  49.  
  50. int main() {
  51.     validaDados();
  52. }
  53.  
  54. //https://pt.stackoverflow.com/q/154923/101
Success #stdin #stdout 0s 4404KB
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OK ate aqui
https://ideone.com/XfR8uW
language:
C99 (gcc 8.3)
created:
5 years ago
visibility:
secret

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