Wednesday, December 30, 2015
C program to round numbers and decimals without using in-built functions
Suppose we want to round off 838.274. Depending on which place value we're rounding to, the final result can vary. For example,
Reference : http://www.calculatorsoup.com/calculators/math/roundingnumbers.php
C Program to round a number to the nearest thousand
C Program to round a number to the nearest hundred
C Program to round a number to the nearest ten
C Program to round a number to the nearest one
C Program to round a number to the nearest tenth
C Program to round a number to the nearest hundredth
- Round to the nearest hundred (838.274) is 800
- Round to the nearest ten (838.274) is 840
- Round to the nearest one (838.274) is 838
- Round to the nearest tenth (838.274) is 838.3
- Round to the nearest hundredth (838.274) is 838.27
Reference : http://www.calculatorsoup.com/calculators/math/roundingnumbers.php
C Program to round a number to the nearest thousand
#include <stdio.h> int main(void) { double a=3250; int x = (a+500)/1000; x = x*1000; printf("%d",x); //3000 return 0; }
C Program to round a number to the nearest hundred
#include <stdio.h> int main(void) { double a=3250; int x = (a+50)/100; x = x*100; printf("%d",x); //3300 return 0; }
C Program to round a number to the nearest ten
#include <stdio.h> int main(void) { double a=323.5; int x = (a+5)/10; x = x*10; printf("%d",x); //320 return 0; }
C Program to round a number to the nearest one
#include <stdio.h> int main(void) { double a=838.274; int x = (a+0.5)*1; x = x/1; printf("%d",x); //838 return 0; }
C Program to round a number to the nearest tenth
#include<stdio.h> int main(void) { float v=838.274; int c, r, m; m = v*100; // m = 83827 c = m%10; // c = 7 r = m/10; // r = 8382 if(c>=5) r++; // r = 8383 v = (float)r/10; printf("Round to the nearest tenth is %.1f", v); // 838.3 return 0; }
C Program to round a number to the nearest hundredth
#include<stdio.h> int main(void) { float v=838.274; int c, r, m; m = v*1000; // m = 838274 c = m%10; // c = 4 r = m/10; // r = 83827 if(c>=5) r++; v = (float)r/100; printf("Round to the nearest tenth is %.2f", v); // 838.27 return 0; }
C Program to round a number to the nearest thousand (another method)
#include<stdio.h> int main() { float a=3250.56; int c = a; // AssigningTruncating decimal part int i=0,len=0; int arr[10]; /* Extracting the digits of the number */ while(c!=0){ arr[i]=c%10; c=c/10; i++; } len=i-1; // Length of the array /* Rounding to the nearest thousand */ if(arr[2]>=5){ arr[3]++; } for(i=0;i<3;i++){ arr[i]=0; } //Program outputs: 3000 for(i=len;i>=0;i--){ printf("%d",arr[i]); } return(0); }
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