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#include <string.h>
#include <stdio.h>
 
int main() {
 
#define STRBUFLENGTH 256
 
	FILE *fin, *fout;
	char strbuf[STRBUFLENGTH];
	int i;
 
 
	while (gets(strbuf, STRBUFLENGTH, stdin) != NULL) {
		for (i=0; strbuf[i] != '\0'; i++) {
			if (strbuf[i] >= 48 && strbuf[i] <= 57)
				printf(stdout, "%c", strbuf[i]);
		}
		printf(stdout, "\n");
	}
 
	printf("Press any key to exit.");
	getchar();
	return 0;
}

Main.java:1: error: illegal character: '#'
#include <string.h>
^
Main.java:1: error: class, interface, or enum expected
#include <string.h>
         ^
Main.java:2: error: illegal character: '#'
#include <stdio.h>
^
Main.java:6: error: illegal character: '#'
#define STRBUFLENGTH 256
^
Main.java:9: error: class, interface, or enum expected
	char strbuf[STRBUFLENGTH];
	^
Main.java:10: error: class, interface, or enum expected
	int i;
	^
Main.java:13: error: class, interface, or enum expected
	while (gets(strbuf, STRBUFLENGTH, stdin) != NULL) {
	^
Main.java:14: error: class, interface, or enum expected
		for (i=0; strbuf[i] != '\0'; i++) {
		          ^
Main.java:14: error: class, interface, or enum expected
		for (i=0; strbuf[i] != '\0'; i++) {
		                             ^
Main.java:17: error: class, interface, or enum expected
		}
		^
Main.java:19: error: class, interface, or enum expected
	}
	^
Main.java:22: error: class, interface, or enum expected
	getchar();
	^
Main.java:23: error: class, interface, or enum expected
	return 0;
	^
Main.java:24: error: class, interface, or enum expected
}
^
14 errors

Standard output is empty