}
do{
s+=i;
}while(i--);
printf(\½á¹ûΪ%d\\n\return 0;
6.3 /*
3. Çó100?200¼äµÄÈ«²¿ËØÊý¡£ÒªÇó±àдһ¸öÅжÏÒ»¸öÕûÊýÊÇ·ñÎªËØÊýµÄº¯Êý£¬²¢ÔÚmainº¯ÊýÖе÷Óøú¯Êý£¬Ã¿¸öÊýÕ¼5Áпí¶È£¬Ã¿ÐÐÊä³ö7¸öËØÊý¡£ */
# include
int i, s=0;
for( i = 100; i <= 200; i++)
if( prime(i) ) { }
printf(\s++;
if(s % 7 == 0)
printf(\
return 0;
int prime(int n) { } 6.4 /*
4.ÒÑÖª°Ù·ÖÖÆ³É¼¨£¨ÓɼüÅÌÊäÈ룩£¬ÒªÇó¼ÆËã²¢Êä³öÎå·ÖÖÆ³É¼¨µÈ¼¶¡®A¡¯¡¢¡®B¡¯¡¢¡®C¡¯¡¢¡®D¡¯¡¢¡®E¡¯¡£
90·ÖÒÔÉÏΪ¡®A¡¯£¬80~89·ÖΪ¡®B¡¯£¬70~79·ÖΪ¡®C¡¯¡¢¡®60~69·ÖΪD¡¯¡¢60·ÖÒÔÏÂΪ¡®E¡¯£¨ÇëÓÃifÓï¾äʵÏÖ£©¡£ */
# include
int main(void) {
float score;
printf(\ÇëÊäÈë·ÖÊý: \scanf(\
if( score >=90 )
printf(\int i;
for( i=2; n % i != 0; i++)
;
//¿ÕÑ»·
return ( n == i );
else if (score >= 80)
printf(\
}
else if (score >= 70)
printf(\
else if (score >= 60)
printf(\
else
printf(\
return 0;
6.5 /*
5. ÒÑÖª°Ù·ÖÖÆ³É¼¨£¨ÓɼüÅÌÊäÈ룩£¬ÒªÇó¼ÆËã²¢Êä³öÎå·ÖÖÆ³É¼¨µÈ¼¶¡®A¡¯¡¢¡®B¡¯¡¢¡®C¡¯¡¢¡®D¡¯¡¢¡®E¡¯¡£
90·ÖÒÔÉÏΪ¡®A¡¯£¬80?89·ÖΪ¡®B¡¯£¬70?79·ÖΪ¡®C¡¯¡¢¡®60?69·ÖΪD¡¯¡¢60·ÖÒÔÏÂΪ¡®E¡¯£¨ÇëÓÃswitchÓï¾äʵÏÖ£©¡£ */
# include
int main(void) {
float score;
printf(\ÇëÊäÈë·ÖÊý: \scanf(\
switch( (int)score / 10 ) {
case 10: case 9:
printf(\
}
}
case 8:
printf(\
case 7:
printf(\
case 6:
printf(\
default:
printf(\
return 0;
6.6
# include
int i;
float temp, a, b, s; a = 2; b = 1; s = 1;
for(i=0; i<20; i++) { }
s += b / a; temp = a; a += b; b = temp;
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