第三次实验

#include <stdio.h> int main() {  int a,b,sum;  a=123;  b=456;  sum=a+b;  printf("sum is %d\n",sum);  return 0; } #include <stdio.h> int main() {  char c1,c2;  c1=97;  c2=98;  printf("c1=%c,c2=%c\n",c1

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