2. Standard Input and Output
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 int putchar(int) |
– putchar(c) puts the character c on the standard output.
– it returns the character printed or EOF on error. |
| int getchar() |
– returns the next character from standard input.
– it returns EOF on error. |
| To use a file instead of standard input or output, use ‘<‘ or ‘>’. |
– input redirecton: prog < infile
– output redirecton: prog > outfile |
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| Example |
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| C:>a.exe < infile |
#include <stdio.h>
int main ()
{
char c;
while ((c=getchar())!= EOF)
{
if ( c>=’A’ && c<=’Z’)
c=c−’A’+’a’ ;
putchar (c);
}
return 0;
} |
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