suppose there is a c program that reads a character and then outputs
scanf("%c", &cha);
printf(%c", cha);when running in this way, you have to type one character at a time. What I want to achieve is to fix this character in a file so that you don"t have to type it repeatedly each time, as long as you don"t change the above two lines of code.
change the input and output stream:
< H1 > include < stdio.h > < / H1 >int main () {
freopen ("in.txt", "r", stdin);
freopen ("out.txt", "w", stdout);
/ ) the code is written as is, and nothing needs to be modified /
fclose (stdin);
fclose (stdout);
return0;
}
use the input pipe | to resolve this problem.
take the linux system as an example, you can do this
echo -n <> | <>
-sharp
echo -n hi | cat -
-sharp
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