Creating .I file in C

Question

Sir pls tell me how to create .I file (extended source file) in c

Answer 1

A common way to create files in C is with the fopen() function.

#include <stdio.h>

FILE *handle;
handle = fopen("extended.I", "w");
if (handle != NULL) {
    /* ... */
    fclose(handle);
}

Answer 2

Terribly vague question, but it sounds like you are using Visual Studio. Right-click your project, Properties, C/C++, Preprocessor, change "Generate Preprocessed File" to Yes.

After you rebuild, you'll get the .i files with the preprocessor output in your project directory.