The eval( Command

Command Summary

Returns the string representation of the value of a real expression.

Command Syntax

eval(expression)

Menu Location

This command is found only in the Catalog. Press:

1. 2ND CATALOG to enter the catalog
2. E to go to commands starting with E
3. Scroll down to eval(.

Calculator Compatibility

TI-84+ CE OS 5.2

Token Size

2 bytes

The eval( command, given an expression that evaluates to a real number, returns the string representation of that number.

eval(1337       //returns "1337"

eval(2.0-3.0    //returns "‾1"

eval(.0001234   //returns "1.234ᴇ‾4"

eval( has more limitations than the toString( command. It cannot handle lists, matrices, or complex numbers (even when the imaginary part of the complex number is zero). Another difference from toString( is that eval( is unaffected by display mode changes like Fix.

Advanced Uses

Use eval( in conjunction with expr( to evaluate a real expression in a string and return the answer in a string.

3.14->X
eval(expr("2X+3
//returns "9.28"

Error Conditions

• ERR:DATA TYPE is thrown when the expression contains a list, matrix, imaginary number, or string.
• ERR:SYNTAX is thrown when trying to evaluate a command that doesn't return a value.

Related Commands

• toString(
• expr(

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