Built-in Functions for NTCAs. strlen char array[10] = “Hello”; int length = strlen(array); cout << length;

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Presentation transcript:

Built-in Functions for NTCAs

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

strlen char array[10] = “Hello”; int length = strlen(array); cout << length; hello\0???? [0][1][2][3][4][5][6][7][8][9]

strlen char array[10] = “Hello”; int length = strlen(array); cout << length; hello\0???? [0][1][2][3][4][5][6][7][8][9]

5

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

strcpy char source[10] = “Hey”; char target[10] = “Boy Howdy”; strcpy(target, source); hey\0?????? [0][1][2][3][4][5][6][7][8][9] source:

strcpy char source[10] = “Hey”; char target[10] = “Boy Howdy”; strcpy(target, source); hey\0?????? [0][1][2][3][4][5][6][7][8][9] source: Boy Howdy\0 [0][1][2][3][4][5][6][7][8][9] target:

strcpy char source[10] = “Hey”; char target[10] = “Boy Howdy”; strcpy(target, source); hey\0?????? [0][1][2][3][4][5][6][7][8][9] source: hey\0Howdy [0][1][2][3][4][5][6][7][8][9] target:

strcpy... strcpy(target, “Hi”); strcpy(target, “BurritoToppings”; Hi\0 Howdy [0][1][2][3][4][5][6][7][8][9] target:

strcpy... strcpy(target, “Hi”); strcpy(target, “BurritoToppings”; BurritoTop [0][1][2][3][4][5][6][7][8][9] target:

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

strcat char source[10] = “There”; char target[10] = “Hi”; strcat(target, source); There\0???? [0][1][2][3][4][5][6][7][8][9] source:

strcat char source[10] = “There”; char target[10] = “Hi”; strcat(target, source); There\0???? [0][1][2][3][4][5][6][7][8][9] source: Hi\0??????? [0][1][2][3][4][5][6][7][8][9] target:

strcat char source[10] = “There”; char target[10] = “Hi”; strcat(target, source); There\0???? [0][1][2][3][4][5][6][7][8][9] source: HiThere\0?? [0][1][2][3][4][5][6][7][8][9] target:

strcat... strcat(target, “!!”); strcat(target, “!”); HiThere\0?? [0][1][2][3][4][5][6][7][8][9] target:

strcat... strcat(target, “!!”); strcat(target, “!”); HiThere!!\0 [0][1][2][3][4][5][6][7][8][9] target:

strcat... strcat(target, “!!”); strcat(target, “!”); HiThere!!! [0][1][2][3][4][5][6][7][8][9] target:

strcmp char ntca1[20] = “bob”; char ntca2[20] = “bob”; char ntca3[20] = “Bob”; 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;

strcmp char ntca1[20] = “bob”; char ntca2[20] = “bob”; char ntca3[20] = “Bob”; 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;

strcmp char ntca1[20] = “bob”; char ntca2[20] = “bob”; char ntca3[20] = “Bob”; 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;

strcmp char ntca1[20] = “bob”; char ntca2[20] = “bob”; char ntca3[20] = “Bob”; 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;

strcmp char ntca1[20] = “bob”; char ntca2[20] = “bob”; char ntca3[20] = “Bob”; 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;

strcmp char ntca1[20] = “bob”; char ntca2[20] = “bob”; char ntca3[20] = “Bob”; 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;

strcmp char ntca1[20] = “bob”; char ntca2[20] = “bob”; char ntca3[20] = “Bob”; 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;

strcmp char ntca1[20] = “bob”; char ntca2[20] = “bob”; char ntca3[20] = “Bob”; 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;

strcmp char ntca1[20] = “bob”; char ntca2[20] = “bob”; char ntca3[20] = “Bob”; 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;

strcmp char ntca1[20] = “bob”; char ntca2[20] = “bob”; char ntca3[20] = “Bob”; 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;

strcmp char ntca1[20] = “bob”; char ntca2[20] = “bob”; char ntca3[20] = “Bob”; 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; Take Note!

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

Also Available  strncpy  strncmp  strncat

End of Session