Relational and Logical Operators

Created: 2022-08-19
Tags: #fleeting

1. > >= < <= This are Relational Operators and they Have same precedence
2. == != This are Logical Operators and have same precedence
3. && still logical Operator
4. || still logical Operator

int i;
for (i=0; i < lim-1 && (c=getchar()) != '\n' && c != EOF; ++i) 
    s[i] = c;
Copy

Expressions connected by && or || are evaluated left to right,
evaluation stops as soon as the truth or falsehood of the result is known

i < lim-1 && (c=getchar()) != '\n' && c != EOF
true && (c=getchar()) != '\n' && c != EOF
true && c != '\n' && c != EOF
true && true && c!= EOF
true && true && true
true && true
true
Copy

1 < 2 && 3 != 4 && 3 > 4
true && 3 != 4 && true
true && true && true
Copy

I think it reads all of the expression first as to evaluate what operator to priortize first
Then it does the evaluation in that manner

A loop equivalent to

for (i=0; i < lim-1 && (c=getchar()) != '\n' && c != EOF; ++i) 
    s[i] = c;
Copy

Constructions like !valid read nicely saying (``if not valid''),