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Edit summary for version 7 :

Version 6

Version 7

Idiom #65 Format decimal number

From real value x in [0,1], create its percentage string representation s with one digit after decimal point. E.g. 0.15625 -> "15.6%"

Idiom #65 Format decimal number

From real value x in [0,1], create its percentage string representation s with one digit after decimal point. E.g. 0.15625 -> "15.6%"

Imports
#include <stdio.h>
Code
printf("%.1lf%%\n",x);