C: 为什么for循环中计数器没有重置为0

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所以我创建了一个简单的 for loop在for loop内。变量frequecyCount没有重置为0，不明白为什么。

我已经遍历了数组 x 和 hist 数组，并且需要一个计数器变量来计算 x 中与 hist 位置相同的值的频率。

#include <stdio.h>

 void  create_hist(double *x, int count, int *hist) {
    int frequencyCount = 0;
    for (int iHist = 0; iHist <= 5; iHist++) {
        //initalize to zero
        hist[iHist] = 0;

        for (int ix = 0; ix < count; ix++) {
            // convert to int
            x[ix] = (int)x[ix];

            if (x[ix] == hist[iHist]) {
                frequencyCount++;
            }
        }
        // add to the hist[] array the frequency count at position i
        hist[iHist] = frequencyCount;
        frequencyCount = 0;
    }

    int main( void ) {
    double x[5] = {0, 0, 0, 0, 3};
    int hist[5];
    int count = 5; 

    create_hist(x, count, hist);

    printf( "\tInput data:\n" );
    for ( int i = 0; i < count; i++ ) {
        printf( "\t%d\t%f\n", i, x[i] );
    }

    printf( "\tHistogram:\n" );
    for ( int i = 0; i <= 5; i++ ) {
        printf( "\t%d\t%d\n", i, hist[i] );
    }

    return 0;

}

Answer 1

尝试这个改变:

for (int iHist = 0; iHist < 5; iHist++) {  // <= changed to <
    int frequencyCount = 0;                // Moved this line to be inside the loop