Don't forget to insert 'Float:' tag.
Code:
public mult(id)
{
new arg[32], Float:value1, Float:value2
read_argv(1,arg,31)
value1 = str_to_float(arg)
value2 = get_cvar_float("number")
new Float:output = value1*value2
client_print(id,print_chat,"[AMXX] Your number is %f",output)
return PLUGIN_HANDLED
}
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