#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#define IX 640			// horizontal resolution of input image

#define IY 480			// vertical resolution of input image

#define OX 640			// horizontal resolution of output image

#define OY 480			// vertical resolution of output image

unsigned char in_img[IX * IY];	// input image 

unsigned char out_img[OX * OY];	// output image 

int aa[IX];

main()

{

    int ix, iy, lev, x, y, k;

    char fname[256];

    FILE *fp;

    char str[256];

/****** Load Image ******/

    printf("Input filename = ");

    scanf("%s", fname);

    printf("Load...\n");

    if ((fp = fopen(fname, "rb")) == NULL) {

	printf("file open error !\n");

    }

    do {

	fscanf(fp, "%s\n", str);

    } while (str[0] == '#');

    if (strncmp(str, "P5", 2) != 0) {

	printf("image type is not P5\n");

    }

    do {

	fscanf(fp, "%s\n", str);

    } while (str[0] == '#');

    sscanf(str, "%d", &ix);

    fscanf(fp, "%d\n", &iy);

    if ((ix != IX) || (iy != IY)) {

	printf("image size is not %d X %d\n", IX, IY);

    }

    do {

	fscanf(fp, "%s\n", str);

    } while (str[0] == '#');

    sscanf(str, "%d", &lev);

    if (lev != 255) {

	printf("image graylevel not 255\n");

    }

    if (fread(in_img, IX * IY, 1, fp) != 1) {

	printf("file read error !\n");

    }

    fclose(fp);

/****** Process Image ******/

    printf("Process...\n");

    for (x = 0; x < OX; ++x) {

	for (y = 0; y < OY; ++y) {

	    out_img[(OX * y + x)] = in_img[(IX * y + x)];

	    aa[x] = out_img[(OX * y + x)] + aa[x];

//          printf("%d\n",aa[x]); 

	}

	printf("%d\n", aa[x]);

    }

/****** Save Image ******/

    printf("Save...\n");

    if ((fp = fopen("copyimg.pgm", "wb")) == NULL) {

	printf("file open error !\n");

    }

    fprintf(fp, "P5\n");

    fprintf(fp, "%d %d\n", OX, OY);

    fprintf(fp, "255\n");

    if (fwrite(out_img, OX * OY, 1, fp) != 1) {

	printf("file write error !\n");

    }

    fclose(fp);

    printf("Save2...\n");

    if ((fp = fopen("pgmdata.txt", "w")) == NULL) {

	printf("file open error !\n");

    }

    for (x = 0; x < IX; x++) {

	fprintf(fp, "%d\n", aa[x]);

    }

//  if(fwrite(aa, IX, 1, fp) != 1) { 

//      printf("file write error !\n"); 

//  } 

    fclose(fp);

}

    do {

	fscanf(fp, "%s\n", str);

    } while (str[0] == '#');

#include<stdio.h>

int main(void) {

    int a, b;

    char c;

    scanf("%d", &a);

    scanf("%d", &b);

    scanf(" %c", &c);

    switch (c) {

      case '+':

	printf("a+b=%d\n", a + b);

	break;

      case '-':

	printf("a-b=%d\n", a - b);

	break;

      default:

	printf("no");

	break;

    }

    return 0;

}