Why does C's printf format string have both

Question

Why does C\'s printf format string have both %c and %s?

I know that %c represents a single character and %s repre

Answer 1

I have done a experiment with printf("%.1s", &c) and printf("%c", c). I used the code below to test, and the bash's time utility the get the runing time.

    #include
    int main(){
        char c = 'a';
        int i;
        for(i = 0; i < 40000000; i++){
            //printf("%.1s", &c); get a result of 4.3s
            //printf("%c", c); get a result of 0.67s
        }
        return 0;
    }

The result says that using %c is 10 times faster than %.1s. So, althought %s can do the job of %c, %c is still needed for performance.