How to test the condition on a vector?

Question

I have to make a program that reads a text, where each first letter of each word in the text is replaced by a character (*). I cannot compile correctly, I believe the problem is in my condition (if).

#include <stdlib.h>
#include <string.h>
#define MAX 500

int main()
{
char text [MAX+1];
int i;

printf("Informe o texto (tamanho maximo %d caracteres:", MAX);
fflush(stdin);
gets(text);

for (i=0; i<=MAX; i++) {
if(' text[i]'==text[i]);
text[i]=' *';

}
printf(" O texto final e %s\n", text);

}

Answer 1

If you need to put * in the first position of each word of a string read from the input try so:

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define MAX 500

int main()
{
    char text [MAX + 1];
    int i;
    printf("Informe o texto (tamanho maximo %d caracteres:", MAX);
    fflush(stdin);
    gets(text);

    for(i = 0; i < MAX; i++)
    {
        if((text[i - 1] == ' ') || ((i == 0) && (text[i] != ' ')))
            text[i] = ' *';
    }
    printf("O texto final e %s\n", text);

}

Missing to include stdio.h to use the printf.

Answer 2

There are some errors, including it does not even compile:

#include <stdio.h>
#define MAX 500

int main() {
    char text [MAX + 1];
    printf("Informe o texto (tamanho maximo %d caracteres:", MAX);
    fgets(text, sizeof(text), stdin);
    text[0] = '*';
    for (int i = 0; i <= MAX; i++) if (text[i] == ' ') text[i + 1] = '*';
    printf("\nO texto final e %s\n", text);
}

Behold working in the ideone. And in the repl it.. Also put on the Github for future reference.

I gave an organized in the code and changed the reading function because the one used is obsolete and insecure. I can improve but I think it solves the purpose.

The use of gets should not be used in any program by any programmer. So much so that the newer compilers (not so new) generate error when using this function and do not compile.

Has a Ask here what you’re talking about.

There’s another one in the English OS.

Answer 3

Funny, your code compiled normally, the only thing I had to add to overwrite all first letters with * was an if checking if the first position is different from empty, so when the user type the first letter with space will not give problem.

#include <stdio.h>
#include <stdlib.h> 
#include <string.h>
#define MAX 500

int main(){
    char text [MAX + 1];
    int i;
    printf("Informe o texto (tamanho maximo %d caracteres:", MAX);
    fflush(stdin);
    gets(text);

    if(text[0] != ' '){
       text[0] = ' *';
    }

    for(i = 0; i < MAX; i++){
        if(text[i] == ' '){
        text[i + 1] = ' *';
    }
}

    printf(" O texto final e %s\n", text);

}

Testing:

Mussum ipsum cacilds, vidis litro abertis.

Upshot:

*ussum *psum *acilds, *idis *itro *bertis.

Answer 4

Your biggest problem is using "characters" with more than one symbol.

' text[i]' has 8 symbols; ' *' has 2 symbols.

Each character should be only 1 symbol.

if (' ' == text[i]) /* ... */;
text[i] = '*';

As other users have noticed, your code has other serious problems.