[問題] 未定義參考到「sqrt」
看板C_and_CPP (C/C++)作者jimmy88224 (jimmy88224)時間12年前 (2013/06/19 22:03)推噓7(7推 0噓 14→)留言21則, 14人參與討論串1/1
編譯器：gcc (Ubuntu/Linaro 4.7.2-2ubuntu1) 4.7.2
#include<stdio.h>
#include<math.h>
main(){
int a,b,c,x1,x2,temp;
while( scanf("%d%d%d",&a,&b,&c) != EOF ){
if(b*b-4*a*c<0){
printf("No real root\n");
continue;
}
x1=( b*-1 + sqrt(b*b-4*a*c) )/(2*a);
x2=( b*-1 - sqrt(b*b-4*a*c) )/(2*a);
if(x1==x2){
printf("Two same roots x=%d\n",x1);
}else if(x1>x2){
printf("Two different roots x1=%d , x2=%d\n",x1,x2);
}else if(x2>x1){
printf("Two different roots x1=%d , x2=%d\n",x2,x1);
}
}
return 0;
}
編譯後出現
/tmp/ccCnZ6KH.o: In function `main':
a006.c:(.text+0x89): 未定義參考到「sqrt」
a006.c:(.text+0x101): 未定義參考到「sqrt」
collect2: 錯誤： ld 回傳 1
該怎麼辦？
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