Map-Reduce in C Language

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#include <stdio.h>#include <stdio.h>#define ERROR -1;/* 函数原型声明 */typedef int (*mapFunction)(int);typedef int (*reduceFunction)(int, int);void map(mapFunction func, int *list, int len) {int i;for (i = 0; i < len; i++) {list[i] = func(list[i]);}}int reduce(reduceFunction func, int *list, int len) {if (len <= 0) {return ERROR;}int result = 0;int i;for (i = 0; i < len; i++) {result = func(result, list[i]);}return result;}/* 函数原型定义 */int square(int i) {return i * i; }int add(int i, int j) {return i + j; }/* 测试 */int main(int argc, char*argv[]) {int array[5] = {1, 2, 3, 4, 5};int len = sizeof(array)/sizeof(array[0]);mapFunction mapFuncPointer = (mapFunction) □reduceFunction reduceFuncPointer = (reduceFunction) &add;map(mapFuncPointer, array, len);  //映射int result = reduce(reduceFuncPointer, array, len); // 化简printf("The result is %d ", result); // 0 + 1 + 4 + 9 + 16 = 30return 0;}