Identify errors in given algorithms and suggest ways of correcting these errors

Including: integer, real, char, string, Boolean. Including: IF statements, CASE statements. Including: count-controlled loops, pre-condition loops, post-condition loops. Including: length, substring, upper, lower. The first character of the string can be position zero or one. Arithmetic, limited to: +, -, /, *, ^ (raised to power of), MOD, DIV. Relational, limited to: =, <, <=, >, >=, <> (not equal to). Logical, limited to: AND, OR, NOT. Including nested selection and iteration. Candidates will not be required to write more than three levels of nested statements. Procedures and functions may have up to three parameters. Including: MOD, DIV, ROUND, RANDOM. Including appropriate use of meaningful identifiers, the commenting feature provided by the programming language, procedures and functions, relevant and appropriate commenting of syntax. Use meaningful identifiers for variables, constants, arrays, procedures and functions.