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- #include <stdio.h>
- int main(){
- int n;
- scanf("%d", &n);
- int sum = 0;
- int i;
- for( i = 1 ; i <= n ; i++ ){
- sum += i;
- printf("%d", i);
- if( i != n ){ // i的值是不是最後一項
- printf("+");
- }
- else {
- printf(" = ");
- }
- }
- printf("%d", sum);
- return 0;
- }
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