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P82CompareFiles.c
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P82CompareFiles.c
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// Program P8.2
#include <stdio.h>
#include <string.h>
#define MaxName 20
#define MaxLine 101
int main() {
char name1[MaxName], name2[MaxName];
char line1[MaxLine], line2[MaxLine];
FILE *file1, *file2, *getFileName(char *, char *);
char *eof1, *eof2;
int lineNum = 0;
file1 = getFileName("First file?", name1);
file2 = getFileName("Second file?", name2);
while (((eof1 = fgets(line1, MaxLine, file1)) != NULL) &&
((eof2 = fgets(line2, MaxLine, file2)) != NULL) &&
(strcmp (line1, line2) == 0))
lineNum++;
// at this stage, linenum is the number of matching lines found
if (eof1 == NULL) //first file ended
if (fgets(line2, MaxLine, file2) == NULL) //second also ended
printf("\nFiles are identical\n\n");
else //first file ended, second file not ended
printf("\n%s, with %d line(s), is a subset of %s\n",
name1, lineNum, name2);
else if (eof2 == NULL) //first file not ended, second file ended
printf("\n%s, with %d line(s), is a subset of %s\n",
name2, lineNum, name1);
else { // mismatch found
printf("\nThe files differ at line %d\n", ++lineNum);
printf("The lines are \n%s and \n%s", line1, line2);
}
fclose(file1);
fclose(file2);
} //end main
FILE * getFileName(char *prompt, char *name) {
//store the filename in 'name' and return the pointer to the file
FILE *filePtr;
do {
printf("%s ", prompt); gets(name);
if ((filePtr = fopen(name, "r")) == NULL)
printf("File does not exist or access denied\n");
} while (filePtr == NULL);
return filePtr;
} //end getFileName