Built-in Functions for NTCAs.

Transcription

1 Built-in Functions for NTCAs

2 strlen char array[10] = Hello ; int length = strlen(array); cout << length;

3 strlen char array[10] = Hello ; int length = strlen(array); cout << length; h e l l o \0????

4 strlen char array[10] = Hello ; int length = strlen(array); cout << length; h e l l o \0????

5

6 strcpy char source[10] = Hey ; char target[10] = Boy Howdy ; strcpy(target, source);

7 strcpy char source[10] = Hey ; char target[10] = Boy Howdy ; strcpy(target, source); source: h e y \0??????

8 strcpy char source[10] = Hey ; char target[10] = Boy Howdy ; strcpy(target, source); source: h e y \0?????? target: B o y H o w d y \0

9 strcpy char source[10] = Hey ; char target[10] = Boy Howdy ; strcpy(target, source); source: h e y \0?????? target: h e y \0 H o w d y \0

10 strcpy... strcpy(target, Hi ); strcpy(target, BurritoToppings ; target: H i \0 \0 H o w d y \0

11 strcpy... strcpy(target, Hi ); strcpy(target, BurritoToppings ; target: B u r r i t o T o p

12 strcat char source[10] = There ; char target[10] = Hi ; strcat(target, source);

13 strcat char source[10] = There ; char target[10] = Hi ; strcat(target, source); source: T h e r e \0????

14 strcat char source[10] = There ; char target[10] = Hi ; strcat(target, source); source: T h e r e \0???? target: H i \0???????

15 strcat char source[10] = There ; char target[10] = Hi ; strcat(target, source); source: T h e r e \0???? target: H i T h e r e \0??

16 strcat... strcat(target,!! ); strcat(target,! ); target: H i T h e r e \0??

17 strcat... strcat(target,!! ); strcat(target,! ); target: H i T h e r e!! \0

18 strcat... strcat(target,!! ); strcat(target,! ); target: H i T h e r e!!!

19 char ntca1[20] = bob ; char ntca2[20] = bob ; char ntca3[20] = Bob ; strcmp cout<<strcmp(ntca1, ntca2); cout<<strcmp(ntca1, ntca3); cout<<strcmp(ntca3, ntca1); cout<<strcmp(ntca1, bobby ); if (!(strcmp(ntca1, ntca2)) cout<< these strings are identical <<endl; else cout<< these strings are different <<endl;

20 char ntca1[20] = bob ; char ntca2[20] = bob ; char ntca3[20] = Bob ; strcmp cout<<strcmp(ntca1, ntca2); cout<<strcmp(ntca1, ntca3); cout<<strcmp(ntca3, ntca1); cout<<strcmp(ntca1, bobby ); if (!(strcmp(ntca1, ntca2)) cout<< these strings are identical <<endl; else cout<< these strings are different <<endl;

21 char ntca1[20] = bob ; char ntca2[20] = bob ; char ntca3[20] = Bob ; strcmp cout<<strcmp(ntca1, ntca2); // 0 cout<<strcmp(ntca1, ntca3); cout<<strcmp(ntca3, ntca1); cout<<strcmp(ntca1, bobby ); if (!(strcmp(ntca1, ntca2)) cout<< these strings are identical <<endl; else cout<< these strings are different <<endl;

22 char ntca1[20] = bob ; char ntca2[20] = bob ; char ntca3[20] = Bob ; strcmp cout<<strcmp(ntca1, ntca2); // 0 cout<<strcmp(ntca1, ntca3); cout<<strcmp(ntca3, ntca1); cout<<strcmp(ntca1, bobby ); if (!(strcmp(ntca1, ntca2)) cout<< these strings are identical <<endl; else cout<< these strings are different <<endl;

23 char ntca1[20] = bob ; char ntca2[20] = bob ; char ntca3[20] = Bob ; strcmp cout<<strcmp(ntca1, ntca2); // 0 cout<<strcmp(ntca1, ntca3); // 1 cout<<strcmp(ntca3, ntca1); cout<<strcmp(ntca1, bobby ); if (!(strcmp(ntca1, ntca2)) cout<< these strings are identical <<endl; else cout<< these strings are different <<endl;

24 char ntca1[20] = bob ; char ntca2[20] = bob ; char ntca3[20] = Bob ; strcmp cout<<strcmp(ntca1, ntca2); // 0 cout<<strcmp(ntca1, ntca3); // 1 cout<<strcmp(ntca3, ntca1); // -1 cout<<strcmp(ntca1, bobby ); if (!(strcmp(ntca1, ntca2)) cout<< these strings are identical <<endl; else cout<< these strings are different <<endl;

25 char ntca1[20] = bob ; char ntca2[20] = bob ; char ntca3[20] = Bob ; strcmp cout<<strcmp(ntca1, ntca2); // 0 cout<<strcmp(ntca1, ntca3); // 1 cout<<strcmp(ntca3, ntca1); // -1 cout<<strcmp(ntca1, bobby ); if (!(strcmp(ntca1, ntca2)) cout<< these strings are identical <<endl; else cout<< these strings are different <<endl;

26 char ntca1[20] = bob ; char ntca2[20] = bob ; char ntca3[20] = Bob ; strcmp cout<<strcmp(ntca1, ntca2); // 0 cout<<strcmp(ntca1, ntca3); // 1 cout<<strcmp(ntca3, ntca1); // -1 cout<<strcmp(ntca1, bobby ); // -1 if (!(strcmp(ntca1, ntca2)) cout<< these strings are identical <<endl; else cout<< these strings are different <<endl;

27 char ntca1[20] = bob ; char ntca2[20] = bob ; char ntca3[20] = Bob ; strcmp cout<<strcmp(ntca1, ntca2); // 0 cout<<strcmp(ntca1, ntca3); // 1 cout<<strcmp(ntca3, ntca1); // -1 cout<<strcmp(ntca1, bobby ); // -1 if (!(strcmp(ntca1, ntca2)) cout<< these strings are identical <<endl; else cout<< these strings are different <<endl;

28 char ntca1[20] = bob ; char ntca2[20] = bob ; char ntca3[20] = Bob ; strcmp cout<<strcmp(ntca1, ntca2); // 0 cout<<strcmp(ntca1, ntca3); // 1 cout<<strcmp(ntca3, ntca1); // -1 cout<<strcmp(ntca1, bobby ); // -1 if (!(strcmp(ntca1, ntca2)) cout<< these strings are identical <<endl; else cout<< these strings are different <<endl;

29 char ntca1[20] = bob ; char ntca2[20] = bob ; char ntca3[20] = Bob ; strcmp cout<<strcmp(ntca1, ntca2); // 0 cout<<strcmp(ntca1, ntca3); // 1 Take Note! cout<<strcmp(ntca3, ntca1); // -1 cout<<strcmp(ntca1, bobby ); // -1 if (!(strcmp(ntca1, ntca2)) cout<< these strings are identical <<endl; else cout<< these strings are different <<endl;

30 Dangers char source[10] = Walk This Way ; char target[15]; strcpy(target, source); strcat(target, source);

31 Also Available strncpy strncmp strncat

32 End of Session