| C语言库函数(E类字母) |
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| 作者:未知 文章来源:网络收集 点击数: 更新时间:2006-3-29 15:22:25
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函数名: ecvt 功 能: 把一个浮点数转换为字符串 用 法: char ecvt(double value, int ndigit, int *decpt, int *sign); 程序例:
#include #include #include
int main(void) { char *string; double value; int dec, sign; int ndig = 10;
clrscr(); value = 9.876; string = ecvt(value, ndig, &dec, &sign); printf("string = %s dec = %d \ sign = %d\n", string, dec, sign);
value = -123.45; ndig= 15; string = ecvt(value,ndig,&dec,&sign); printf("string = %s dec = %d sign = %d\n", string, dec, sign);
value = 0.6789e5; /* scientific notation */ ndig = 5; string = ecvt(value,ndig,&dec,&sign); printf("string = %s dec = %d\ sign = %d\n", string, dec, sign);
return 0; }
函数名: ellipse 功 能: 画一椭圆 用 法: void far ellipse(int x, int y, int stangle, int endangle, int xradius, int yradius); 程序例:
#include #include #include #include
int main(void) { /* request auto detection */ int gdriver = DETECT, gmode, errorcode; int midx, midy; int stangle = 0, endangle = 360; int xradius = 100, yradius = 50;
/* initialize graphics, local variables */ initgraph(&gdriver, &gmode, "");
/* read result of initialization */ errorcode = graphresult(); if (errorcode != grOk) /* an error occurred */ { printf("Graphics error: %s\n", grapherrormsg(errorcode)); printf("Press any key to halt:"); getch(); exit(1); /* terminate with an error code */ }
midx = getmaxx() / 2; midy = getmaxy() / 2; setcolor(getmaxcolor());
/* draw ellipse */ ellipse(midx, midy, stangle, endangle, xradius, yradius);
/* clean up */ getch(); closegraph(); return 0; }
函数名: enable 功 能: 开放硬件中断 用 法: v[1] [2] [3] [4] 下一页
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