Why when I wan to compile the following multi thread merge sorting C program, I receive this error:
ap@sharifvm:~/forTHE04a$ gcc -g -Wall -o mer mer.c -lpthreadmer.c:4:20: fatal error: iostream: No such file or directory #include <iostream> ^compilation terminated.ap@sharifvm:~/forTHE04a$ gcc -g -Wall -o mer mer.c -lpthreadmer.c:4:22: fatal error: iostream.h: No such file or directory #include <iostream.h> ^compilation terminated.My program:
#include <stdio.h>#include <stdlib.h>#include <pthread.h>#include <iostream>using namespace std;#define N 2 /* # of thread */int a[] = {10, 9, 8, 7, 6, 5, 4, 3, 2, 1}; /* target array *//* structure for array index * used to keep low/high end of sub arrays */typedef struct Arr { int low; int high;} ArrayIndex;void merge(int low, int high){ int mid = (low+high)/2; int left = low; int right = mid+1; int b[high-low+1]; int i, cur = 0; while(left <= mid && right <= high) { if (a[left] > a[right]) b[cur++] = a[right++]; else b[cur++] = a[right++]; } while(left <= mid) b[cur++] = a[left++]; while(right <= high) b[cur++] = a[left++]; for (i = 0; i < (high-low+1) ; i++) a[low+i] = b[i];}void * mergesort(void *a){ ArrayIndex *pa = (ArrayIndex *)a; int mid = (pa->low + pa->high)/2; ArrayIndex aIndex[N]; pthread_t thread[N]; aIndex[0].low = pa->low; aIndex[0].high = mid; aIndex[1].low = mid+1; aIndex[1].high = pa->high; if (pa->low >= pa->high) return 0; int i; for(i = 0; i < N; i++) pthread_create(&thread[i], NULL, mergesort, &aIndex[i]); for(i = 0; i < N; i++) pthread_join(thread[i], NULL); merge(pa->low, pa->high); //pthread_exit(NULL); return 0;}int main(){ ArrayIndex ai; ai.low = 0; ai.high = sizeof(a)/sizeof(a[0])-1; pthread_t thread; pthread_create(&thread, NULL, mergesort, &ai); pthread_join(thread, NULL); int i; for (i = 0; i < 10; i++) printf ("%d ", a[i]); cout << endl; return 0;}