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//bismillahir rahmanir rahim
///rabiulrafi01@gmail.com
///jessore university of science & technology 
//__________________________//
 
#include<stdio.h>
#include<string.h>
int main()
{
char num[105],last_char;
int i,j,sum,l,k,last_num­,sum1,sum2,r,r1,ck;
while(scanf("%s",num­)==1)
{
if(strcmp(num,"0")==­0)
{
break;
}
sum=0;
ck=0;
l=strlen(num);
 
for(i=1;i<=l;i++)
{
last_char=num[l-i];
last_num=last_char-'­0';
sum=sum+last_num;
}
 
 
sum1=0;
while(sum!=0)
{
r=sum%10;
sum1=sum1+r;
sum=sum/10;
}
if(sum1>=10)
{
sum2=0;
while(sum1!=0)
{
r1=sum1%10;
sum2=sum2+r1;
sum1=sum1/10;
ck=1;
}
}
if(ck==1){
printf("%d\n",sum2);
}
else
printf("%d\n",sum1);
 
 
 
}
return 0;
}

prog.m: In function ‘main’:
prog.m:11:25: error: stray ‘\302’ in program
 int i,j,sum,l,k,last_num­,sum1,sum2,r,r1,ck;
                         ^
prog.m:11:26: error: stray ‘\255’ in program
 int i,j,sum,l,k,last_num­,sum1,sum2,r,r1,ck;
                          ^
prog.m:12:21: error: stray ‘\302’ in program
 while(scanf("%s",num­)==1)
                     ^
prog.m:12:22: error: stray ‘\255’ in program
 while(scanf("%s",num­)==1)
                      ^
prog.m:14:21: error: stray ‘\302’ in program
 if(strcmp(num,"0")==­0)
                     ^
prog.m:14:22: error: stray ‘\255’ in program
 if(strcmp(num,"0")==­0)
                      ^
prog.m:25:20: warning: multi-character character constant [-Wmultichar]
 last_num=last_char-'­0';
                    ^~~~~
prog.m:11:15: warning: unused variable ‘k’ [-Wunused-variable]
 int i,j,sum,l,k,last_num­,sum1,sum2,r,r1,ck;
               ^
prog.m:11:7: warning: unused variable ‘j’ [-Wunused-variable]
 int i,j,sum,l,k,last_num­,sum1,sum2,r,r1,ck;
       ^

Standard output is empty