统计字符串中 E 出现的次数：
SELECT LENGTHB(TRANSLATE("WWW.QQFDC.COM","Q"||"WWW.QQFDC.COM","Q")) FROM DUAL;SELECT LENGTHB("WWW.QQFDC.COM")-LENGTHB(REPLACE("WWW.QQFDC.COM","Q",""))
#include
#include
int countchar(char *str,char a){
int n=0;
int i = 0;
while(*(str+i)!=" "){
if(*(str+i) == a)
n++;
i++;
}
return n;
}
int main() {
char
