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int main(int argc, char ** argv) { int i,j,k; char buff[100]; printf("input n;\n"); fgets(buff, sizeof(buff), stdin); int n = atoi(buff); if(n < 0){printf("you must die.\n"); exit(-1);} double * pdbl1 = (double *)malloc(sizeof(double)*n*n); if(pdbl1 == NULL){printf("you are not lucky!\n");exit(-1);} double * pdbl2 = (double *)malloc(sizeof(double)*n*n); if(pdbl2 == NULL){printf("you are the most unlucky man in the world!\n");exit(-1);} for(i = 0 ; i < n ; i++) { for(j = 0 ; j < n ; j++) { fgets(buff, sizeof(buff), stdin); pdbl1[j + i * n] = atol(buff); } } for(i = 0 ; i < n ; i++) { for(j = 0 ; j < n ; j++) { fgets(buff, sizeof(buff), stdin); pdbl2[j + i * n] = atol(buff); } } printf("matrix A = \n"); for(i = 0 ; i < n ; i++) { for(j = 0 ; j < n ; j++) { printf("%lf,", pdbl1[j + i * n]); } printf("\n"); } printf("\n"); printf("matrix B = \n"); for(i = 0 ; i < n ; i++) { for(j = 0 ; j < n ; j++) { printf("%lf,", pdbl2[j + i * n]); } printf("\n"); } printf("\n"); printf("matrix A*B = \n"); for(i = 0 ; i < n ; i++) { for(j = 0 ; j < n ; j++) { double total = 0.0; for(k = 0 ; k < n ; k++) { total += pdbl1[i * n + k]*pdbl2[k * n + j]; } printf("%lf,", total); } printf("\n"); } free(pdbl1); free(pdbl2); return 0; }
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