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Limpando Matriz

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Veja o código seguinte:

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

int main()
      char str[] = { "Cinderela e aladim, abracadabra e abramelim..." };
      printf( "%s\n", str );
      memset( str, '-', strlen( str ) * sizeof( char ) );
      puts( "%s\n", str );
      system( "pause" );
      return 0;

O segundo parâmetro de memset especifica o dado que você irá atribuir aos primeiros strlen( str ) * sizeof( char ) bytes do bloco de memória apontado pelo primeiro argumento. No caso acima, a string str será substituída por uma sequência de caracteres '-' (exceto o terminador nulo).

Boa sorte!

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