#include /*----------------------------------------------------------------------------------*/ int strlength(char * string) { /* returns the length of a string */ /* We have provided the answer to this first exercise to get you started: int i=0; while (string[i]) i++; return i; */ } /*----------------------------------------------------------------------------------*/ int strisalpha(char * string) { /* returns 1 if string contains only alphabetic characters else returns 0 */ } /*----------------------------------------------------------------------------------*/ int strfirst(char * string, char letter) { /* returns the index of the first occurrence of letter in string or -1 if it does not occur */ } /*----------------------------------------------------------------------------------*/ int strlast(char * string, char letter) { /* returns the index of the last occurence of letter in string or -1 if it does not occur */ } /*----------------------------------------------------------------------------------*/ void strcopy(char * string1, char * string2) { /* copies string1 to string 2 */ } /*----------------------------------------------------------------------------------*/ void strhead(char * string1, char * string2, int n) { /* copies the first n characters of string1 to string2 */ } /*----------------------------------------------------------------------------------*/ void strtail(char * string1, char * string2, int n) { /* copies the last n characters of string1 to string2 */ } /*----------------------------------------------------------------------------------*/ void strmid(char * string1, int start, int end, char * string2) { /* copies the characters of string1 from start to end (inclusive) to string2 */ } /*----------------------------------------------------------------------------------*/ void strnodup(char *string) { /* removes any duplicate characters from string1 e.g. "abcdabcaba" would become "abcd" */ } /*----------------------------------------------------------------------------------*/ int isprefix(char * string1, char * string2) { /* if string1 is a prefix of string2 returns 1 else returns 0 e.g. isprefix("hello","hello world") returns 1 isprefix("world","hello world") returns 0 Note that we define an empty string to be a valid prefix of any string. Thus isprefix("", "hello world") returns 1 and isprefix("", "") returns 1 */ } /*----------------------------------------------------------------------------------*/ /* If you choose to answer coursework option A then You will need to put the function that answers courswork Option A here */ /*----------------------------------------------------------------------------------*/ /* If you choose to answer coursework option B then You will need to put the function that answers courswork Option B here */ /*----------------------------------------------------------------------------------*/ /* Utility functions */ /*----------------------------------------------------------------------------------*/ int promptUserForChoice() { int choice = -1; char input[256]; while (choice < 0 || choice > 13) { printf("\n"); printf("--------------------------------------------------------\n"); printf("Options:\n"); printf(" QUIT TESTING (0) TEST strhead (7) \n"); printf(" TEST EVERYTHING (1) TEST strtail (8) \n"); printf(" TEST strlength (2) TEST strmid (9) \n"); printf(" TEST strisalpha (3) TEST strnodup (10) \n"); printf(" TEST strfirst (4) TEST isprefix (11) \n"); printf(" TEST strlast (5) CWK question A (12) \n"); printf(" TEST strcopy (6) CWK question B (13) \n"); printf("Choice ? "); scanf(" %s", input); choice = atoi(input); printf("Selected %i\n\n", choice); } return choice; } void testing(char * name) { printf("\n"); printf("--------------------------------------------------------\n"); printf(" Testing:\t%s\n",name); printf("\n"); } void promptAndGetString(char * str) { char junk; str[0] = '\0'; printf("Enter a string : "); scanf("%c%[^\n]", &junk, str); printf("You entered \"%s\"\n",str); } /*----------------------------------------------------------------------------------*/ /* Main Program */ /*----------------------------------------------------------------------------------*/ main() { char stringA[1024], stringB[1024]; int start, end, n, i, testno; char letter; testno = promptUserForChoice(); while (testno != 0) { switch (testno) { case 1 : printf(">> \tSelected everything\n"); printf(">> \tEach test will be run once\n"); case 2 : testing("strlength"); promptAndGetString(stringA); n=strlength(stringA); printf("\"%s\" has length %d\n",stringA,n); if (testno != 1) break; case 3 : testing("strisalpha"); promptAndGetString(stringA); if (strisalpha(stringA)) printf(" \"%s\" contains only alphabetic chars\n",stringA) ; else printf(" \"%s\" contains non-alphabetic chars\n",stringA) ; if (testno != 1) break; case 4 : testing("strfirst"); promptAndGetString(stringA); printf("Input a letter (char)? "); scanf(" %c", &letter); n=strfirst(stringA,letter); if (n<0) printf(" \"%s\" does not contain %c\n",stringA, letter) ; else printf(" %c first occurs as \"%s\"[%d] \n",letter, stringA, n) ; if (testno != 1) break; case 5 : testing("strlast"); promptAndGetString(stringA); printf("Input a letter (char)? "); scanf(" %c", &letter); n=strlast(stringA,letter); if (n<0) printf(" \"%s\" does not contain %c\n",stringA, letter) ; else printf(" %c last occurs as \"%s\"[%d] \n",letter, stringA, n) ; if (testno != 1) break; case 6 : testing("strcopy"); promptAndGetString(stringA); strcopy(stringA,stringB); printf("Original string is\t\"%s\"\n",stringA); printf("..Copied string is\t\"%s\"\n",stringB); if (testno != 1) break; case 7 : testing("strhead"); promptAndGetString(stringA); printf("Take how many from head? "); scanf(" %i",&n); strhead(stringA,stringB,n); printf(" First %d of \"%s\" is \"%s\"\n",n,stringA,stringB); if (testno != 1) break; case 8 : testing("strtail"); promptAndGetString(stringA); printf("Take how many from tail? "); scanf(" %i",&n); strtail(stringA,stringB,n); printf(" Last %d of \"%s\" is \"%s\"\n",n,stringA,stringB); if (testno != 1) break; case 9 : testing("strmid"); promptAndGetString(stringA); printf("Start from which position? "); scanf(" %i",&start); printf("Up to which position? "); scanf(" %i",&end); strmid(stringA,start,end,stringB); printf(" \"%s\" [%d .. %d] is \"%s\"\n",stringA,start,end,stringB); if (testno != 1) break; case 10 : testing("strnodup"); promptAndGetString(stringA); strnodup(stringA); printf(" with duplicates removed is \"%s\"\n",stringA); if (testno != 1) break; case 11 : testing("isprefix"); printf("string1: "); promptAndGetString(stringA); printf("string2: "); promptAndGetString(stringB); n=isprefix(stringA,stringB); if (n) printf(" \"%s\" is a prefix of %s\n",stringA, stringB); else printf(" \"%s\" is NOT a prefix of %s\n",stringA, stringB); if (testno != 1) break; case 12 : testing("Coursework Option A"); printf("During the coursework part 2 practical test you may\n"); printf("choose to implement this option (A). It will be easier\n"); printf("to implement than option B and, as such, will not gain\n"); printf("maximum marks - even for a perfect solution. Therefore,\n"); printf("the penalties and rewards are lower for this option.\n"); printf("The specification of this option (A) wil be published\n"); printf("on the day of the test itself.\n"); if (testno != 1) break; case 13 : testing("Coursework Option B"); printf("During the coursework part 2 practical test you may\n"); printf("choose to implement this option (B). It will be more\n"); printf("difficult to implement than option A and, as such, will\n"); printf("permit maximum marks to be gained. However, a poor\n"); printf("solution will be marked rigorously. So the penalties\n"); printf("and rewards are higher for this option.\n"); printf("The specification of this option (B) wil be published\n"); printf("on the day of the test itself.\n"); if (testno != 1) break; default : printf("SWITCH ERROR: Should never get here!\n"); } /* end switch */ testno = promptUserForChoice(); } /* end while */ printf("\nBYE :-)\n"); } /* end main */