为什么计数器不起作用

我想帮助一个朋友,我似乎无法得到它们.我不知道为什么但几个变量没有正确显示.

我把它撞到了我认为问题所在的地方,但我不知道如何解决它.

#include 
#include 
using namespace std;
int main() 
{
//declaring variables
ifstream myfile("input.txt");
double grades[26];
unsigned scores[8] = {0};




//getting data from text file
    for(int i=0; i<26; i++)
        {
            myfile >> grades[i];
            cin.ignore();


    if((grades[i] >= 175) && (grades[i] <= 200)) scores[7]++; 
    else if(grades[i] >= 150)                    scores[6]++;
    else if(grades[i] >= 125)                    scores[5]++;
    else if(grades[i] >= 100)                    scores[4]++;
    else if(grades[i] >= 75)                     scores[3]++;
    else if(grades[i] >= 50)                     scores[2]++;
    else if(grades[i] >= 25)                     scores[1]++;
    else if(grades[i] >= 0)                      scores[0]++;
      }

//outputing results


for(int z = 0; z < 200; z += 25)
{
    if(z == 175)
        cout << "Number of students between 175 and 200: " << scores[z] << endl;
    else
        cout << "Number of students between " << z << " and " << z + 24 << ": " << scores[z]<< endl;
}

return 0;
}

它从中提取的文件中有这个.

76, 89, 150, 135, 200, 76, 12, 100, 150, 28, 178, 189, 167, 200, 175, 150, 87, 99, 129, 149, 176, 200, 87, 35, 157, 189

我知道问题出在了某个地方

//getting data from text file
    for(i=0; i<26; i++)
        {
            myfile >> grades[i];
            cin.ignore();

我不知道该怎么做才能解决它,我不知道为什么它会被打破.

输出是

   Number of students between 0 and 24: 25
Number of students between 25 and 49: 32767
Number of students between 50 and 74: 3900547712
Number of students between 75 and 99: 0
Number of students between 100 and 124: 0
Number of students between 125 and 149: 32760
Number of students between 150 and 174: 0
Number of students between 175 and 200: 32767

当输出应该是.
0-24:12之间的学生人数

我不知道为什么它不能正常工作.感谢让我知道将输出放在这里......忘了.