Using fmt.Printf with a dynamic first argument can lead to unexpected output. The first argument is a format string, where certain character combinations have special meaning.

Forming the first parameter via string concatenation with user input should be avoided for the same reason. When printing user input, either use a variant of fmt.Print, or use the %s Printf verb and pass the string as an argument.

Bad practice

s := "Interest rate: 5%"
fmt.Printf(s) // Prints: Interest rate: 5%!(NOVERB)

Recommended

s := "Interest rate: 5%"
fmt.Print(s) // Prints: Interest rate: 5%

s := "Interest rate: 5%"
fmt.Printf("%s", s) // Prints: Interest rate: 5%

concourse / concourse

No ignore rules found