what's wrong in this programm...i would convert a sentence in code ascii

Question

#include<stdio.h>
#include<string.h>
#include<stdlib.h>
int main ()

{char ch[100];
int a,i;

gets (ch);

for(i=0;i<strlen(ch);i++)

a=ch[i];

{ i++;}

printf("le message cod est %d \n",a);

return 0;}

Answer 1

for(i=0;i<strlen(ch);i++)
a+=ch[i]; // <- here;