#include <stdio.h>
#define N 100000
void Read(char dna[]);
char Dnao(char dna[]);
char Dnat(char dna[]);
char Mrna(char dna[]);
char Res(char dna[]);
int main()
{
    char dna[N];
    printf ("输入的DNA单链为:");
    char Dnao(char dna);
    printf ("对应的DNA单链为:");
    char Dnat(char dna);
    printf ("转录生成的mRNA为:");
    char Mrna(char dna);
    printf ("翻译合成的蛋白质的氨基酸序列为:");
    char Res(char dna);




    return 0;
}
void Read(char dna[]);
{
    int i=-1;
    do
    {
        i++;
        scanf("%c",dna[]);
    }while(dna[] != '\0');
}

scanf（"%c", dna + i)                     可以以$为结束标志                          dna[i] != '$'    然后再dna[i] = '\o'

啥意思呢

void Read(char dna[]);
{
    int i=-1;
    do
    {
        i++;
        scanf("%c",dna[]);
        fflush(stdin);
    }while(dna[] != '\0');
}