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In this tutorial, we will be discussing a program to understand coroutines in C/C++.Coroutines are control instructions which switch the execution control between two routines which returning any of them.Example Live Demo#include int range(int a, int b){ static long long int i; static int state = 0; switch (state){ case 0: state = 1; for (i = a; i < b; i++){ return i; //returning control case 1:; //resuming control } } state = 0; return 0; } int main(){ int i; for (; i=range(1, 5);) printf("control at main :%d", i); return 0; }Outputcontrol at main :1 control at main :2 control at main :3 control at main :4
In this tutorial, we will be discussing a program to create a C/C++ code formatting tool with the help of clang tools.SETUPsudo apt install python sudo apt install clang-format-3.5Then we will create a python file in location where the current user has read and write permissions.Exampleimport os cpp_extensions = (".cxx", ".cpp", ".c", ".hxx", ".hh", ".cc", ".hpp") for root, dirs, files in os.walk(os.getcwd()): for file in files: if file.endswith(cpp_extensions): os.system("clang-format-3.5 -i -style=file " + root + "/" + file)Create a file formatting file in the top directory of the current user.Outputclang-format-3.5 -style=google -dump-config ... Read More
In this tutorial, we will be discussing a program to count distinct consecutive sub-string of length two using C++ STL.For this we will provided with a string. Our task is to count and print all the unique substrings of length two from the given string.Example Live Demo#include using namespace std; void calc_distinct(string str){ map dPairs; for (int i=0; i
In this tutorial, we will be discussing a program to count inversions using set in C++ STL.Inversion count is a measure of how near the array is to be completely sorted. If the array is already sorted, the inversion count will be 0.Example Live Demo#include using namespace std; //returning inversion count int get_Icount(int arr[],int n){ multiset set1; set1.insert(arr[0]); int invcount = 0; //initializing result multiset::iterator itset1; for (int i=1; i
In this tutorial, we will be discussing a program to count the number of 1’s and 0’s in a binary array using STL in C++.For this we will be provided with an array. Our task is to count the number of 0’s and 1’s present in the array.Example Live Demo#include using namespace std; // checking if element is 1 or not bool isOne(int i){ if (i == 1) return true; else return false; } int main(){ int a[] = { 1, 0, 0, 1, 0, 0, 1 }; int n = sizeof(a) / sizeof(a[0]); int count_of_one = count_if(a, a + n, isOne); cout
In this tutorial, we will be discussing a program to count smaller elements on right side using set in C++ STL.For this we will be provided with an array. Our task is to construct a new array and add the number of smaller elements on the right side of the current element at its position.Example Live Demo#include using namespace std; void count_Rsmall(int A[], int len){ set s; int countSmaller[len]; for (int i = len - 1; i >= 0; i--) { s.insert(A[i]); auto it = s.lower_bound(A[i]); countSmaller[i] = ... Read More
In this tutorial, we will be discussing a program to count smaller elements in sorted array in C++.In this we will be given a number and our task is to count all the elements present in the sorted array which are smaller than the given number.Example Live Demo#include using namespace std; int countSmaller(int arr[], int n, int x){ return upper_bound(arr, arr+n, x) - arr; } int main(){ int arr[] = { 10, 20, 30, 40, 50 }; int n = sizeof(arr)/sizeof(arr[0]); cout
In this tutorial, we will be discussing a program to understand core dump (segmentation fault) in C/C++.It happens due to reasons like when code tries to write on read only memory or tries to access corrupt memory location.ExampleModifying a string literalint main(){ char *str; str = "GfG"; *(str+1) = 'n'; return 0; }Accessing out of array index bounds#include using namespace std; int main(){ int arr[2]; arr[3] = 10; return 0; }Accessing an address which is freed#include #include int main(void){ int* p = malloc(8); *p = 100; free(p); *p = 110; return 0; }OutputAbnormal termination of program
In this tutorial, we will be discussing a program to understand how to convert strings into numbers in C/C++.C/C++ provides two ways to convert strings into numbers.Example Live DemoUsing sscanf()#include int main(){ const char *str = "12345"; int x; sscanf(str, "%d", &x); printf("The value of x : %d", x); return 0; }OutputThe value of x : 12345Using stoi() Live Demo#include #include using namespace std; int main(){ string str1 = "45"; string str2 = "3.14159"; string str3 = "31337 geek"; int myint1 = stoi(str1); int myint2 = stoi(str2); int myint3 = stoi(str3); cout
In this tutorial, we will be discussing a program to understand how to convert a string into integer array in C/C++.For this we will create a new array. Traverse through the given string, if the character is a comma “, ”, we move on to the next character else add it to the new array.Example Live Demo#include using namespace std; //converting string to integer array void convert_array(string str){ int str_length = str.length(); int arr[str_length] = { 0 }; int j = 0, i, sum = 0; //traversing the string for (i = 0; str[i] != ... Read More