因为x=1,三个if的条件都不满足；建议修改如下：main(){int x,y,z，b[3],i,j,k;printf("input number:\n");scanf("%d,%d,%d",&x,&y,&z);b[0]=x;b[1]=y;b[2]=z;for(i=0;ib[j]){
k=b;
b=b[j];
b[j]=k;
}
}}for(i=0;i改成y){t=x;x=y;y=t;} /*交换x,y的值*/if(x>z){t=x;x=z;z=t;}/*交换x,z的值*/if(y>z){t=y;y=z;z=t;}/*交换z,y的值*/printf("small to big: %d %d %d\n",x,y,z);}
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