結構_ASCII出現頻率

#include <stdio.h>
#include <string.h>
#include <limits.h>
#include <stdlib.h>

typedef struct pair {
    int frequency;
    char charASCII;
} pair;

void print(pair* myData)
{
    int i;
    for (i = 0; i < 128; i++)
        (myData[i].frequency == 0) ? printf("") : printf("%d %d\n", myData[i].charASCII, myData[i].frequency);
}

int main()
{
    struct pair* myData = (struct pair*)malloc(128 * sizeof(struct pair));
    int i, len, flag = 0;
    char str[9999];

    while ( gets_s(str) != NULL) {
        if (flag != 0) printf("\n");
        flag++;

        for (int i = 0; i < 128; i++) {
            myData[i].frequency = 0;
        }
        len = strlen(str);
        for (int i = 0; i < len; i++) {
            myData[str[i]].charASCII = str[i];
            myData[str[i]].frequency= myData[str[i]].frequency+1;
        }

        for (int i = 127; i >= 0; i--) {
            for (int j = 0; j < i; j++) {
                if (myData[j].frequency > myData[j + 1].frequency) {
                    int temp1 = myData[j].charASCII;
                    myData[j].charASCII = myData[j + 1].charASCII;
                    myData[j + 1].charASCII = temp1;

                    int temp2 = myData[j].frequency;
                    myData[j].frequency = myData[j+1].frequency;
                    myData[j+1].frequency = temp2;
                }
                else if (myData[j].frequency == myData[j + 1].frequency) {
                    if (myData[j].charASCII < myData[j + 1].charASCII) {
                        struct pair temp = myData[j];
                        myData[j] = myData[j + 1];
                        myData[j + 1] = temp;
                    }
                }
            }
        }
        print(myData);
    }
    return 0;
}