int count1=0,count2=0,count3=0,count4=0; for(int i=0;i<150;i++) { if(s[i].Category==1) { if(s[i].Scheme==1) { count1++; } else if(s[i].Scheme==2) { count2++; } } else if(s[i].Category==2) { if(s[i].Scheme==1) { count3++; } else if(s[i].Scheme==2) { count4++; } } } not very understand this part,I need an expert help to give me explanation

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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int count1=0,count2=0,count3=0,count4=0;
for(int i=0;i<150;i++)
{
if(s[i].Category==1)
{
if(s[i].Scheme==1)
{
count1++;
}
else if(s[i].Scheme==2)
{
count2++;
}
}
else if(s[i].Category==2)
{
if(s[i].Scheme==1)
{
count3++;
}
else if(s[i].Scheme==2)
{
count4++;
}
}
}


not very understand this part,I need an expert help to give me explanation

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