why use % two times in if statement after top 10 when result show one time %, what is the mean of second percentage?

Question

int main() {
int score = 91;
if (score >= 90)
printf("Top 10%%.\n");
else
printf("Less than 90.\n");
return 0;
}

Answer 1

You dont need there.. It's your string which you want to output.
In printf function, text between " ", every character are printed as it is except escape sequence characters such as \n \t, and %d, %f. These are replaced by its corresponding values and arguments..
Read about escape charecters in c. And
Ex:
int rank=1;
printf(" Your Rank =%d", rank) ;
Output is
Your Rank=1.//%d is replaced by rank value..
But in your example it is your choice of writing twice only..
printf("%%%%%") ; for this,
Output is %%%%% only,, observe difference..