K & R C Programs Exercise 7-7.

K and R C, Solution to Exercise 7-7:
K and R C Programs Exercises provides the solution to all the exercises in the C Programming Language (2nd Edition). You can learn and solve K&R C Programs Exercise.
C program to modify the pattern-finding program of chapter 5(C Programming Language  2nd Edition, page no 117.) to take its input from a set of named files or, if no files are named as arguments, from the standard input. Should the file name be printed when a matching line is found.Read more about C Programming Language .

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#define MAXLINE 1000

/*print lines that match pattern from 1st argument */
main(int argc, char *argv[])
char pattern[MAXLINE];
int c, excpet = 0,number = 0;
FILE *fp;
void fpat(FILE *fp, char *fname, char *pattern, int except, int number);

while(--argc > 0 && (*++argv)[0] == '-')
while(c = *++argv[0])
switch(c) {
case 'x':
except = 1;
case 'n':
number = 1;
printf("find:illigal option %cn",c);
argc = 0;
if(argc >= 1)
strcpy(pattern, *argv);
printf("Usage:find[-x] [-n] pattern [file....]n");
if(argc == 1)
while(--argc > 0)
if((fp = fopen(*++argv,"r")) == NULL) {
fprintf(stderr,"find:can't open %sn",*argv);
} else {
fpat(fp, *argv, pattern,except,number);
return 0;

/*fpat: find pattern*/
void fpat(FILE *fp, char *fname, char *pattern, int except, int number)
char line[MAXLINE];
long loneno = 0;

while(fgets(line, MAXLINE, fp) != NULL){
if((strstr(line,pattern) != NULL) !=except) {
printf("%s -",fname);
printf("%ld: ",lineno);

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