Un algorithme ou language c

variable
int i;
float s=1,x=1;
\\ s c'est la somme 
for(i=3;i<=300;i=i+3){
s=s-(x/i);
x= -x;
}
printf("la some S est %d " ,s);

$ gcc -Wall ayoub.c
ayoub.c: In function ‘main’:
ayoub.c:12:2: warning: format ‘%d’ expects argument of type ‘int’, but argument 2 has type ‘double’ [-Wformat=]
  printf("la some S est %d " ,s);
  ^