//字符类型判断 #include <stdio.h> void count(char *s, int *digit, int *letter, int *other, int *lower, int *k) {
int i; for(i=0;i<10;i++) {
if(s[i]>='a'&&s[i]<='z') (*letter)++; else if(s[i]>='A'&&s[i]<='Z') (*lower)++; else if(s[i]>'0'&&s[i]<'9') (*digit)++; else if(s[i]==' ') (*k)++; else
(*other)++;
}

}

int main() { int x=0,y=0,z=0,a=0,b=0; char ch[80]; printf("Enter a string:"); gets(ch); count(ch,&x,&y,&z,&a,&b); printf("小写字母有：%d个,大写字母有：%d个,数字有: %d个,空格有: %d个,其它符号有:%d个\n",x,y,z); }

//斐波那契数列 #include <stdio.h> void fib(int n) { int i,a,b,c; for(i=0;i<n;i++) { if(i>1) { c=a+b; printf("%d ",c); a=b; b=c; } else { a=1; b=1; printf("1 "); } } }

int main(void) { int i; scanf("%d",&i); fib(i);
return 1; }