visual studio express complains missing ';' after type in c program

Question

What is the problem with my code?

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

int main() {
    FILE *file;

    char string[32] = "Teste de solução";

    file = fopen("C:\file.txt", "w");

    printf("Digite um texto para gravar no arquivo: ");
    for(int i = 0; i < 32; i++) {
        putc(string[i], file);
    }

    fclose(file);

    return 0;
}

Error:

c:\users\guilherme\documents\visual studio 2010\projects\helloworld\helloworld\hello.c(13): error C2143: syntax error : missing ';' before 'type'
1>c:\users\guilherme\documents\visual studio 2010\projects\helloworld\helloworld\hello.c(13): error C2143: syntax error : missing ';' before 'type'
1>c:\users\guilherme\documents\visual studio 2010\projects\helloworld\helloworld\hello.c(13): error C2143: syntax error : missing ')' before 'type'
1>c:\users\guilherme\documents\visual studio 2010\projects\helloworld\helloworld\hello.c(13): error C2143: syntax error : missing ';' before 'type'
1>c:\users\guilherme\documents\visual studio 2010\projects\helloworld\helloworld\hello.c(13): error C2065: 'i' : undeclared identifier
1>c:\users\guilherme\documents\visual studio 2010\projects\helloworld\helloworld\hello.c(13): warning C4552: '<' : operator has no effect; expected operator with side-effect
1>c:\users\guilherme\documents\visual studio 2010\projects\helloworld\helloworld\hello.c(13): error C2065: 'i' : undeclared identifier
1>c:\users\guilherme\documents\visual studio 2010\projects\helloworld\helloworld\hello.c(13): error C2059: syntax error : ')'
1>c:\users\guilherme\documents\visual studio 2010\projects\helloworld\helloworld\hello.c(13): error C2143: syntax error : missing ';' before '{'
1>c:\users\guilherme\documents\visual studio 2010\projects\helloworld\helloworld\hello.c(14): error C2065: 'i' : undeclared identifier
========== Rebuild All: 0 succeeded, 1 failed, 0 skipped ==========

Answer 1

Evidently you are compiling this as C, not C++. VS doesn't support C99, in which case you may not do this:

for (int i = 0; i < 32; i++)

You need to do this instead:

int i;

...

for(i = 0; i < 32; i++)

Where the declaration of i must come before all statements in the function.