for 循环学习，输出

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/*问题：金字塔图案，学习使用for 循环时间：2016/4/6*/#include <stdio.h>int main(void){for (int i = 0; i < 5; i++){char ch = 'A';for (int j = 4-i; j >=0; j--)printf(" ");for (int x = 0; x <= i; x++, ch++)    printf("%c",ch);ch = 'A' + i-1;for (int y = 0; y < i; y++, ch--)printf("%c", ch);printf("\n");}return 0;}

/*问题：学习使用strlen()时间：2016/4/6*/#include <stdio.h>#include <string.h>int main(void){char word[20];printf("please input a word: ");scanf_s("%s", word);//gets_s(word, 20);printf("%s\n", word);for (int i = strlen(word)-1; i >= 0; i--)printf("%c", word[i]);printf("\n");return 0;}

/*问题：学习使用 for,九九乘法表时间：2016/4/7*/#include <stdio.h>int main(void){for (int i = 1; i < 10; i++){for (int j = 1; j <= i; j++)printf("%d*%d=%2d ", j, i, j*i);printf("\n");}return 0;}

/*问题：累计时间：2016/4/10*/#include <stdio.h>int main(void){double num1[8], num2[8];for (int i = 0; i < 8; i++)scanf_s("%lf", &num1[i]);/*for (int j = 0; j < 8; j++){num2[j] = 0;for (int t = 0; t <= j; t++)num2[j] += num1[t];}*/num2[0] = num1[0];for (int j = 1; j < 8; j++)num2[j] = num2[j - 1] + num1[j];for (int m = 0; m < 8; m++)printf("%8.3f", num1[m]);printf("\n");for (int n = 0; n < 8; n++)printf("%8.3f", num2[n]);printf("\n");return 0;}

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