I want to update my C code with eliminating Ctype.h library -

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i have written c code using ctype.h library . must update code same output , can't use ctype.h , string.h libraries . think should use new functions in , math not , don't know how can . searched couldn't find useful results . can me update code ? code works in way : when give reverse sentence , converts sentence usual.

example input: od uoy tnaw ot eunitnoc?

output: want continue?

here code :

#include <stdio.h> #include <ctype.h>  int main() {    char sentence[100];    int ch, i, j, k;     (i=0; i<sizeof(sentence)-1; i++)         if ((sentence[i] = getchar()) == '\n')             break;     sentence[i] = '\0';     (j = 0; j <=i; j++)    {        if(sentence[j]==' ' || sentence[j]=='\0')        {            for( k=j-1;sentence[k]!=' ' && k>=0;k--)            {                ch=sentence[k];                putchar(ch);            }            printf(" ");          }      }      return 0; }

this code works correctly without both header files. have tried? – karthikeyan.r.s


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