Strings Questions

• sizeof an array of pointers and strlen of the first word: assume pointer size is 4 bytes. What does this print? #include #include int main() { char str[] = {'Frogs', 'Do', 'Not', 'Die', 'They', 'Croak!'}; printf('%d, %d', sizeof(str), strlen(str[0])); return 0; }
• Modifying a char array then attempting to reassign it: what does this program do? #include int main() { char str[] = 'Nagpur'; // writable array str[0] = 'K'; // modify first character → 'Kagpur' printf('%s, ', str); str = 'Kanpur'; // attempt to reassign an array variable printf('%s', str+1); return 0; }
• Editing a printf format string in a writable array: what is printed? #include int main() { char p[] = '%d '; // writable copy of the format p[1] = 'c'; // change '%d' to '%c' printf(p, 65); return 0; }
• Pointer arithmetic on string literals with printf: what is printed? #include int main() { printf(5 + 'Good Morning '); return 0; }
• Copying a C string using pointer assignment in the while condition and again in the body: what final string is printed? #include int main() { char str1[] = 'Hello'; char str2[10]; char *t, *s; s = str1; t = str2; while (*t = *s) *t++ = *s++; printf('%s ', str2); return 0; }
• Type mismatch: attempting to store a string literal in a single char variable. What happens? #include int main() { char str = 'CuriousTab'; // invalid: char cannot hold a whole string printf('%s ', str); return 0; }
• Pointer arithmetic on string literals with printf: determine the output. #include int main() { printf(5 + 'CuriousTab '); return 0; }
• In C, what is the output of this string-library expression (concatenation + copy + compare)? #include #include int main() { static char str1[] = "dills"; static char str2[20]; static char str3[] = "Daffo"; int i; i = strcmp(strcat(str3, strcpy(str2, str1)), "Daffodills"); printf("%d ", i); return 0; }
• In C on a typical 32-bit model (char=1 byte, int=4 bytes, float=4 bytes), what does sizeof report? #include int main() { char ch = 'A'; printf("%d, %d, %d", sizeof(ch), sizeof('A'), sizeof(3.14f)); return 0; }
• In C string-pointer assignment sequencing, what prints? #include int main() { char t; /* unused */ char *p1 = "India", p2; p2 = p1; / p2 points to "India" / p1 = "CURIOUSTAB";/ p1 now points elsewhere */ printf("%s %s ", p1, p2); return 0; }
• In C, what is sizeof for this compound string with embedded nulls? #include int main() { char str[] = "India\0CURIOUSTAB\0"; printf("%d ", sizeof(str)); return 0; }
• In C, printf return value in an if-condition with an empty C-string literal element. #include int main() { int i; char a[] = "\0"; /* a[0] == 0, array is a valid empty string */ if (printf("%s", a)) printf("The string is empty "); else printf("The string is not empty "); return 0; }
• In C, basic strlen on a digit-only literal: what is printed? #include #include int main() { printf("%d ", strlen("123456")); return 0; }
• In Turbo C (16-bit), what happens when you assign a string literal to a single char element? #include int main() { char str[10] = "India"; str[6] = "CURIOUSTAB"; /* invalid: assigning char* to char / printf("%s ", str); return 0; }
• In C, swapping function parameters passed by value (pointers to string literals): what prints? #include void swap(char *, char *); int main() { char *pstr[2] = {"Hello", "CuriousTab"}; swap(pstr[0], pstr[1]); printf("%s %s", pstr[0], pstr[1]); return 0; } void swap(char *t1, char *t2) { char *t; t = t1; t1 = t2; t2 = t; }
• In C, 2D array-of-strings indexing vs pointer arithmetic: what characters print? #include int main() { static char mess[6][30] = { "Don't walk in front of me...", "I may not follow;", "Don't walk behind me...", "Just walk beside me...", "And be my friend." }; printf("%c, %c ", *(mess[2] + 9), ((mess + 2) + 9)); return 0; }
• On a 16-bit Turbo C/DOS platform (int=2 bytes), what does sizeof report for these literals? #include int main() { printf("%d, %d, %d", sizeof(3.0f), sizeof('3'), sizeof(3.0)); return 0; }
• In C programming on a 32-bit system (pointer size = 4 bytes), what will this program print for sizeof results of an array versus a pointer, and of the pointed elements? #include int main() { char a[] = "Visual C++"; /* array holds characters plus the '\0' terminator */ char b = "Visual C++"; / pointer to string literal */ printf("%d, %d ", sizeof(a), sizeof(b)); printf("%d, %d", sizeof(*a), sizeof(*b)); return 0; }
• In C programming, consider the fixed-size array below. Will this program compile and what would be printed if it did? #include int main() { char str[7] = "CuriousTab"; /* literal length exceeds array capacity */ printf("%s ", str); return 0; }