Programming in C - Unit 2.9 & 2.12

Vocabulary flashcards based on Unit 2.9 and 2.12 lecture notes on C programming expressions and type conversion hierarchy.

Relational Expression truth value

The result of an expression like $y = (x > y)$. In C, this always gives truth values; for example, if $x = 20$ and $y = 30$, the result is $0$.

Logical Expression result ($a=3, b=2, c=5, z=10$)

For the expression x = (a > b) \, && \, (c > z), the result is $0$ because both statements must be true for the total expression to be true, but the second expression truth value is false.

Implicit Type Conversion

A process where C automatically converts any intermediate values to the proper type so that the expression can be evaluated without losing any significance.

Conversion Hierarchy

The automatic order in C for promoting types: $\text{Long double} \rightarrow \text{Double} \rightarrow \text{Float} \rightarrow \text{Unsigned long int} \rightarrow \text{Long int} \rightarrow \text{Unsigned int} \rightarrow \text{int} \rightarrow \text{char/short}$.

Truth Values in C

The values returned by relational and logical expressions, where $0$ represents false and non-zero (typically $1$) represents true.