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                通過學習if條件判斷和for循環之后,做了一個實例。實現的實例都在代碼中有詳細的注釋。 ~~~ #include <stdio.h> /**************************** * 輸入一個數字n,求 * 1+1+2+1+2+3+1+2+3+4...+n * 該實例主要為了練習if語句和for語句 ****************************/ int main(void) { printf("%s\n","Please enter the number n:"); int n; int count = 0; scanf("%d",&n); if(n <= 0){ //如果輸入的數字n小于0,則提示錯誤 printf("%s\n","The number you entered is too small!!"); return -1; } int i; for(i = 1;i <= n;i++){ int j; for(j = 1;j <= i;j++){ count += j; } } printf("The count of the number n = %d.\n",count); return 0; } ~~~ 在C語言中,不像C++,要求比較高,是不能這樣使用的。 ~~~ for(int i = 0;i < 4;i++) ~~~ 這樣在編譯的時候就會報這樣的錯誤 ~~~ /** * error:'for' initial declaration are * only allowed in C99 mod */ ~~~ 所以在C語言中,最好是提前聲明一下變量。
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