scanf error in C++ - program doesn't respond -
okay weird. when remove int count = 1 , count++; code, program gives no error. if remove scanf , not remove count++; program gives no error count++;. have nothing each other why happening?
#include <stdio.h> #include <string> #include <stdlib.h> #include <math.h> int is_prime(int num) { int isprime = 0; (int = 2; <= sqrt(num); += 2) { if (i % 2 == 0) i++; if ((int(num) % i) == 0) { return isprime = 1; break; } } return isprime; } int main(int argc, char **argv) { int = 0; char *buffer; printf("enter sentence:\n"); scanf("%[^\n]", buffer); char array[1000] = " "; char temp[2] = " "; int count = 1; (int = 0; < 100; i++) { array[i] = buffer[i]; = array[i]; int primefind = is_prime(a); if (a % 2 == 0) { printf("%c", a); // nothing } else if (primefind == 0 && % 1 == 0) { printf("%c", a); count++; } else { a++; temp[0] = a; printf("%c", a); } } }
char *buffer; printf("enter sentence:\n"); scanf("%[^\n]", buffer); buffer not initialized there. has "random" value. (indeterminate technical term).
update
just fun, here's c++ version:
#include <iostream> #include <cmath> #include <algorithm> bool is_prime(int num) { if (num % 2 == 0) return false; (int = 3; <= sqrt(num); += 2) if (num % == 0) return false; return true; } int main() { //// test functions! // (int = 1; < 100; ++i) { if (is_prime(i)) std::cout << << " "; } return 0; std::cout << "enter sentence: "; std::string line; if (std::getline(std::cin, line)) { std::string encoded; size_t count = 0; std::transform( line.begin(), line.end(), back_inserter(encoded), [&count] (uint8_t ch) -> char { if (ch % 2 == 0) return ch; // nothing if (is_prime(ch) && ch % 2 == 1) { count++; return ch; } return ch + 1; }); std::cout << "result: " << encoded << "\n"; std::cout << "count: " << count << "\n"; } } when typing sentence the lazy cow jumped on seedy moon! output is:
enter sentence: lazy cow jumped on seedy moon! result: lazz dpx jvmped pver teedz mppn" count: 9 
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