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Programming & Software Q&A | CollectiveSolver
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Welcome to collectivesolver - Programming & Software Q&A with code examples. A website with trusted programming answers. All programs are tested and work.
Contact: aviboots(AT)netvision.net.il
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Recent questions tagged c
40,023
questions
51,974
answers
573
users
Recent questions tagged c
1
answer
42
views
How to find all the distinct ways to write 5 as a sum of the numbers 1–4 in C
asked
Dec 24, 2025
by
avibootz
c
c-all-distinct-ways-write-5-as-sum-of-1-4
all-distinct-ways-write-5-as-sum-of-1-4
1
answer
35
views
How to detect and remove invisible or non‑printing characters that break a string in C
asked
Dec 23, 2025
by
avibootz
c
c-detect-remove-invisible-non-printing-characters-string
detect-remove-invisible-non-printing-characters-string
1
answer
35
views
How to mask a range of sensitive parts of a string for general-purpose masking in C
asked
Dec 23, 2025
by
avibootz
c
c-mask-range-sensitive-parts-string
mask-range-sensitive-parts-string
1
answer
37
views
How to mask sensitive parts of a string (e.g. credit card numbers) in C
asked
Dec 23, 2025
by
avibootz
c
c-mask-sensitive-parts-string
mask-sensitive-parts-string
2
answers
32
views
How to mask sensitive parts of a string (e.g. email addresses) in C
asked
Dec 23, 2025
by
avibootz
c
c-mask-sensitive-parts-string
mask-sensitive-parts-string
2
answers
46
views
How to check if the sum of two halves of a number is equal in C
asked
Dec 22, 2025
by
avibootz
c
c-sum-two-halves-number-equal
sum-two-halves-number-equal
1
answer
39
views
How to check if two halves of a number are equal in C
asked
Dec 21, 2025
by
avibootz
c
c-two-halves-number-equal
two-halves-number-equal
2
answers
48
views
How to check if two strings are isomorphic in C
asked
Dec 18, 2025
by
avibootz
c
c-check-two-strings-isomorphic
check-two-strings-isomorphic
1
answer
59
views
How to remove text between parentheses in a string using C
asked
Dec 17, 2025
by
avibootz
c
c-remove-text-between-parentheses-in-string
remove-text-between-parentheses-in-string
1
answer
40
views
How to find out what percentage N is of a whole number in C
asked
Dec 17, 2025
by
avibootz
c
c-percentage-n-of-whole-number
percentage-n-of-whole-number
1
answer
37
views
How to move all special characters to the beginning of a string in C
asked
Dec 12, 2025
by
avibootz
c
c-move-special-characters-beginning-string
move-special-characters-beginning-string
1
answer
58
views
How to find the missing number in an array containing numbers from 1 to n in O(1) time complexity with C
asked
Dec 9, 2025
by
avibootz
c
c-missing-number-array-o1-time-complexity
missing-number-array-o1-time-complexity
1
answer
59
views
How to calculate the area of a triangle using Heron’s formula in C
asked
Dec 9, 2025
by
avibootz
c
c-area-triangle-herons-formula
area-triangle-herons-formula
1
answer
64
views
How to write an equivalent to PHP implode(string $separator, array $array): string in C
asked
Dec 5, 2025
by
avibootz
c
c-implode
php-implode-cpp
implode-function
1
answer
50
views
How to check if all word in an array exists in a given string with C
asked
Dec 3, 2025
by
avibootz
c
c-all-word-array-exists-string
all-word-array-exists-string
1
answer
44
views
How to format an array of strings in lines with maxWidth without breaking the words in C
asked
Dec 2, 2025
by
avibootz
c
c-format-array-strings-lines-maxwidth
format-array-strings-lines-maxwidth
1
answer
58
views
How to check if the last index of an array is reachable by jumping based on element values from index 0 in C
asked
Dec 1, 2025
by
avibootz
c
c-last-index-array-jumping-by-elements-value
last-index-array-jumping-by-elements-value
1
answer
44
views
How to find two prime numbers that, when concatenated, form another prime number in C
asked
Nov 28, 2025
by
avibootz
c
c-prime-concatenate
prime-concatenate
1
answer
43
views
How to generate an N-digit integer random number in C
asked
Nov 27, 2025
by
avibootz
c
c-n-digit-integer-random
n-digit-integer-random
1
answer
43
views
How to select random two digits from anywhere in a number with C
asked
Nov 26, 2025
by
avibootz
c
c-random-two-anywhere-digits
random-two-anywhere-digits
1
answer
39
views
How to select random two consecutive digits from a number in C
asked
Nov 25, 2025
by
avibootz
c
c-random-two-consecutive-digits
random-two-consecutive-digits
1
answer
50
views
How to select random three digits from anywhere in a 6-digit number in C
asked
Nov 25, 2025
by
avibootz
c
c-random-three-anywhere-digits
random-three-anywhere-digits
1
answer
41
views
How to select random three consecutive digits from a 6-digit number in C
asked
Nov 25, 2025
by
avibootz
c
c-random-three-consecutive-digits
random-three-consecutive-digits
1
answer
41
views
How to convert a degree to a compass direction in C
asked
Nov 24, 2025
by
avibootz
c
c-degree-compass-direction
degree-compass-direction
1
answer
54
views
How to calculate the sum of all Fibonacci numbers between two left and right indices in C
asked
Nov 23, 2025
by
avibootz
c
c-sum-fibonacci-numbers
sum-fibonacci-numbers
1
answer
64
views
How to generate all possible permutations and combinations of an array of chars in C
asked
Nov 21, 2025
by
avibootz
c
c-array-all-permutations-combinations
all-permutations-combinations
1
answer
50
views
How to find the first 4-digit prime number where all digits are unique in C
asked
Nov 20, 2025
by
avibootz
c
c-4-digit-prime-unique
4-digit-prime-unique
1
answer
57
views
How to write an equivalent to PHP explode(string $separator, string $string, int $limit = INT_MAX): array in C
asked
Nov 20, 2025
by
avibootz
c
c-explode
php-explode-c
explode-function
1
answer
48
views
How to generate a random integer from a range [0, N] that is not in a unique integer list with C
asked
Nov 19, 2025
by
avibootz
c
c-random
c-random-excluding-list
random-excluding-list
1
answer
47
views
How to replace all occurrences of a specific digit in a floating-point number with C
asked
Nov 18, 2025
by
avibootz
c
c-replace-all-occurrences-digit-float
replace-all-occurrences-digit-float
1
answer
49
views
How to calculate the length of legB and hypotenuse of a right-angle triangle with a given perimeter and legA in C
asked
Nov 17, 2025
by
avibootz
c
c-right-angle-triangle
right-angle-triangle
1
answer
50
views
How to replace a digit in a floating-point number by index with C
asked
Nov 17, 2025
by
avibootz
c
c-replace-digit-float
replace-digit-float
2
answers
52
views
How to extract the first digit from a floating-point number in C
asked
Nov 17, 2025
by
avibootz
c
c-extract-first-digit-floating-point
extract-first-digit-floating-point
1
answer
54
views
How to check whether each substring range (L to R) from an array of substring ranges is a palindrome in C
asked
Nov 16, 2025
by
avibootz
c
c-substring-range-palindrome
substring-range-palindrome
1
answer
48
views
How to write an equivalent to PHP count_chars(string $string, int $mode = 0): array|string function in C
asked
Nov 16, 2025
by
avibootz
c
c-count-chars
php-count-chars-c
count-chars
1
answer
54
views
How to convert an array of strings and group all the anagrams into subarrays in C
asked
Nov 14, 2025
by
avibootz
c
c-array-anagram
group-anagrams
1
answer
55
views
How to get all the substrings with exactly k distinct characters from a given string in C
asked
Nov 14, 2025
by
avibootz
c
c-substring
c-string
substrings-with-k-distinct-characters
1
answer
50
views
How to find the K smallest numbers in an unsorted array with C
asked
Nov 12, 2025
by
avibootz
c
c-find-array
1
answer
67
views
How to find the Kth smallest number in an unsorted array with C
asked
Nov 11, 2025
by
avibootz
c
c-find-array
1
answer
62
views
How to return a pointer to an array of int pointers from a function in C
asked
Nov 10, 2025
by
avibootz
c
c-pointers
1
answer
47
views
How to return two pointers from a function in C
asked
Nov 10, 2025
by
avibootz
c
c-pointers
1
answer
41
views
How to find a list of numbers up to a limit that is a palindrome in base 10 and base 2 in C
asked
Nov 10, 2025
by
avibootz
c
c-bouble-base-palindrome
1
answer
47
views
How to calculate the full number from a percentage of a number in C
asked
Nov 9, 2025
by
avibootz
c
c-percentage
1
answer
48
views
How to find all the numbers that are equal to the sum of the factorials of their digits in C
asked
Nov 9, 2025
by
avibootz
c
c-numbers
c-factorials
1
answer
51
views
How to find the numbers that are the sum of fifth powers of their digits in C
asked
Nov 8, 2025
by
avibootz
c
c-numbers
c-fifth-power
1
answer
56
views
How to find the numbers that are the sum of fourth powers of their digits in C
asked
Nov 8, 2025
by
avibootz
c
c-fourth-power
c-numbers
1
answer
68
views
How to find the floor and ceiling of the value N in an unsorted array with C
asked
Nov 7, 2025
by
avibootz
c
c-ceil
c-floor
c-array
1
answer
49
views
How to use strlen with a pointer to an array of pointers to strings in C
asked
Nov 7, 2025
by
avibootz
c
c-array
c-pointers
1
answer
65
views
How to use strlen with an array of pointers to strings in C
asked
Nov 7, 2025
by
avibootz
c
c-pointers
c-array
1
answer
46
views
How to find the total number of combinations of given coins to reach a specific amount in C
asked
Nov 5, 2025
by
avibootz
c
c-combination
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