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Mixed & Character Expressions

Mixed expressions
Mixed expressions in Arithmetic Expression are formed by using different types of integer, real, double precision or complex quantities.
Example:
Consider an arithmetic expression in which integer and real quantities occurs
let I=5 and C= 2.5.This means here I is integer and C is real .If both are added then
I + C = 7.5
Here the integer value is automatically converted into real value, that means 5 becomes 5.0.And the value of I remains the integer in the computer memory.
Character Expressions
Character expression is an expression whose operands have the character type.
Expression Meaning
a // z concatenate a with z
Consider A1, A2, A3 are declared as complex then it will be written in program as:
COMPLEX A1, A2, A3
If A1 = (1.5, 2.5), A2 =(2.0, 3.5) and A3 = (1.0, 2.0) then Fortran expression for the evaluation (1.5, 2.5) + (2.0, 3.5) – (1.0, 2.0) will be A1 + A2 -A3. Similarly other examples can be also written.
Example:
– IC * IA +IB
Here IC, IA, IB are unsigned integer variable and -, +, and * are arithmetic operators.
3) An integer expression enclosed in parentheses is an integer expression.
Example:
( -J * K +I) is an integer expression.;
Note: Two arithmetic operators should not occur in succession in an integer expression.
This is wrong to express:
Example:
IC -* IA