The io.c

#include "defines.h"

void update_lhs(void);

extern char buffer[MaxExp+2];

extern int lhs;

void prompt(void)

{

printf("\n%d ", lhs);

}

void input(void)

{

char * nl;

fgets(buffer, MaxExp, stdin);

if ( (nl = strchr(buffer, '\n') ) != NULL)

*nl = '\0'; /* eliminate new line */

}

void output(void)

{

printf("%d %s == ", lhs, buffer);

update_lhs();

printf("%d\n", lhs);

}

This is program io.c

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