Lab 9 v1, C (gcc) - rextester

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//gcc 5.4.0

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

int main(void){
int n=4;
int m=4;
int ca=0;
int cb=0;
int ci=0;
int c=0;
char A[4]={'a','b','c','d',};
char B[4]={'c','d','e','f',};
//char U[30];
char I[30];
//n=sizeof(A)/4;
//m=sizeof(B)/4;
char U[n+m];
//printf("%d=n+m\n",n+m);
printf("Intersection\n");
for(int i=0;i<=n;i++){
   for(int j=0;j<=n;j++){
       if(A[i]==B[j]){
       I[ci]=A[i];
       printf("%c\n",I[ci]);
             ci++;      
                     }
                         }
                     }
printf("\n\n");
printf("Union\n");
for(int g=0;g<n+m;g++){
    if(g<n){
    U[c]=A[ca];
    printf("%c\n",U[c]);
    ca++;
    c++;
           }
    else{
         for(int d=0;d<m;d++){
             if(B[d]==I[d]){
                cb++;       
                  }
              else{
                  U[c]=B[cb];
                printf("%c\n",U[c]);
                cb++;
                c++;
               // printf("=cb%d\n",cb);
                  }
                           }   
        }
                      }  
printf("\n\n");
        }

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Compilation time: 0.12 sec, absolute running time: 0.14 sec, cpu time: 0 sec, memory peak: 3 Mb, absolute service time: 0,34 sec