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#include <stdio.h>
#include <stdlib.h>
 
typedef struct {
    int kokugo;
    int eigo;
} Seiseki;
 
int main(){
    int i, n = 5;
    Seiseki *SS;
    Seiseki *pt;
    SS = (Seiseki *)malloc(sizeof(Seiseki)*n);
    if(SS == NULL) return 0;
    pt = SS;
    for(i=0;i<n;i++){
        pt->kokugo = i*10;
        pt->eigo = i*5;
        //printf("%d,%d\n",SS[i].kokugo,SS[i].eigo);
        //printf("%d,%d\n",SS[i]->kokugo,SS[i]->eigo);
        //printf("%d,%d\n",pt[i].kokugo,pt[i].eigo);
        printf("%d,%d\n",pt[i]->kokugo,pt[i]->eigo);
        pt++;
    }
    free(SS);
    return 0;
}
 

prog.c: In function ‘main’:
prog.c:22:31: error: invalid type argument of ‘->’ (have ‘Seiseki’ {aka ‘struct <anonymous>’})
         printf("%d,%d\n",pt[i]->kokugo,pt[i]->eigo);
                               ^~
prog.c:22:45: error: invalid type argument of ‘->’ (have ‘Seiseki’ {aka ‘struct <anonymous>’})
         printf("%d,%d\n",pt[i]->kokugo,pt[i]->eigo);
                                             ^~

Standard output is empty