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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include <string.h>
  4.  
  5. int main(void) {
  6.     char* letra = "A";
  7.     char *buffer = malloc(strlen(letra) + 6); //6 é o tamanho de "echo ", incluindo o terminador, dá para optimizar
  8.     if (sprintf(buffer, "echo %s", letra) > 0) printf(buffer);
  9.     else printf("algo deu errado");
  10. }
  11.  
  12. //https://pt.stackoverflow.com/q/311764/101
Success #stdin #stdout 0s 4352KB
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stdin
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Standard input is empty
stdout
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echo A
https://ideone.com/vR05V4
language:
C99 (gcc 8.3)
created:
5 years ago
visibility:
public

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