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How can I redirect stdin or stdout to a file from within a program?
C Interview Questions and Answers
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How can I redirect stdin or stdout to a file from within a program?
Use freopen. If you're calling a function f() which writes to stdout, and you want to send its output to a file, and you don't have the option of rewriting f, you can use a sequence like:
freopen(file, "w", stdout);
f();
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