mirror of https://github.com/TheAlgorithms/C
58 lines
1.3 KiB
C
58 lines
1.3 KiB
C
#include <stdio.h>
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#include <string.h> // we include the library string.h to the use of string
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void saisie (char *cpointeur); // Prototypes of the three functions used in the program
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int compte (char *s);
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char* miroir (char * s);
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int main (int argc , char *argv[])
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{
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char chaine[20];
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saisie(chaine);
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printf("miroir est %s",miroir(chaine));
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}
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// this function is used to put a string
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void saisie (char *cpointeur)
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{
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printf("saisir une chaine\n");
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scanf("%s",cpointeur);
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}
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/* the function miroir (in french ) it means "mirror" , the major idea is to permute the first caractere with the last using an auxilary
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variable (aux) the the 2nd character with the penultimate one and so on .
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we made a call to the function (compte) which counts the length of the string . As you can see clearly , I substruct 1 from the equation
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k = compte(s)-1 ; to get rid of the EOF caractere which is '\0' because it is not a caractere from the string typed */
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char* miroir (char *s)
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{
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int i ;
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char aux ;
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int k ;
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k = compte(s)-1 ;
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i = 0 ;
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while(i<=k)
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{
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aux = s[i];
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s[i]=s[k];
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s[k]=aux ;
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k-- ;
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i++ ;
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}
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return s ;
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}
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// compte plays the role of strlen so we can change it by an strlen function if you want that
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int compte (char *s)
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{
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char *p ;
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int k ;
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p=s ;
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k=0 ;
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while(*p!='\0')
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{
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p++ ;
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k++ ;
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}
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return k ;
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}
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