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| #include <stdio.h> | |
| #include <string.h> | |
| int main(int argc, char **argv) | |
| { | |
| FILE *ifp = NULL; | |
| FILE *ofp = NULL; | |
| char wrd[40] = { 0 }; | |
| char line[256] = { 0 }; | |
| if(argc > 1 && !strcmp(argv[1], "stdio")) { | |
| /* Use standard input/output streams | |
| * to read/write information. This is | |
| * useful when we want to use redirections | |
| * that are commonly used in UNIX environments. */ | |
| ifp = stdin; | |
| ofp = stdout; | |
| } | |
| else { | |
| /* Open files for reading and writing. If one | |
| * of them fails to open, we return 1 indicating | |
| * an unexpected end of the program's execution. */ | |
| ifp = fopen("in.txt", "r"); | |
| ofp = fopen("out.txt", "w"); | |
| if(!ifp || !ofp) | |
| return 1; | |
| } | |
| /* Go through the input file line by line */ | |
| while(fgets(line, sizeof(line), ifp)) { | |
| /* This sscanf call is just to ensure that a string | |
| * has less than five words. The sscanf function returns | |
| * the amount of items it has filled; we can abuse this | |
| * mechanic and test whether there are five words or not. */ | |
| if(sscanf(line, "%39s %39s %39s %39s %39s", wrd, wrd, wrd, wrd, wrd) < 5) { | |
| /* Print the line to the output file | |
| * and go on with the next one. */ | |
| fputs(line, ofp); | |
| continue; | |
| } | |
| } | |
| /* Close files. */ | |
| fclose(ofp); | |
| fclose(ifp); | |
| return 0; | |
| } |
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