C語(yǔ)言函數(shù)大全(e開(kāi)頭)

函數(shù)名: ecvt
    功 能: 把一個(gè)浮點(diǎn)數(shù)轉(zhuǎn)換為字符串
    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;
    }