@taruieiji

/*E2-3*/
/*2数の和と差*/
#include <stdio.h>
int main(void) 
{
    int a,b,wa,sa;
    a=20;
    b=5; 
    wa=a+b;
    sa=a-b;

/*E2-2*/
/*文字列の出力*/
#include <stdio.h>
int main(void) 
{
    printf("computer\n");
    printf("programming\n");
    return 0;
} 

#include <stdio.h>
int main(void) 
{
    int a, b, wa;
    a = 20;
    b = 5;
    wa = a+d;
    printf("%d\n",wa);
    return 0;
}

#include <stdio.h>

int main(void) 
{
    int a, b, wa;
    a = 20;
    b = 5;
   wa=a+b;
   printf("%d\n", wa);  
    return 0;

#include <stdio.h>

int main(void)
{
    printf("Hello world!\n");
    return 0;
}