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trocar letras e depois inverter uma string


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Eu já consegui alterar todas as letras que queria numa sequência. Depois de alteradas preciso que a sequência se inverta. Como faço isso?

O código está aqui:

#include <stdio.h>
#include <string.h>

int trocarDNA(char string[])

int i = 0;

while(string[i] != '\0')

	if(string[i] == 'A')

		string[i] = 'T';
	else if(string[i] == 'T')
			string[i] = 'A';
	else if(string[i] == 'C')
			string[i] = 'G';
	else if(string[i] == 'G')
			string[i] = 'C';

return 0;


int main(){

char string[300]; 

int i = 0;

printf("Introduza a sequencia de DNA (maiusculas): \n");



printf("Complemento: \n");

for(i; i<=strlen(string); i++)

	printf("%c", string[i]);

return 0;

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